Painting Tenders
Painting Tenders
Indian Army Tender
Goods
Electrical Goods and Equipments...+2Furnitures and Fixtures, Electrical and Electronics
GEM
Bareilly, Uttar Pradesh
Description: CATEGORY: Genr set 30 KVA engine overhualing and Repair of Panel
board and other issues , Genr set 30 KVA replace of
mounting chassis and armature fixing , Genr set 35 KVA
engine overhualing and Repair of Panel board and other
issues , Genr set 3 KVA engine overhualing and other issues
, Genr Spares I e Fuel filter Oil filter Air filter Fan belt
Exhaust Fan Mounting Pad etc , Canopy Repair , Armature
rewinding , Armature cooling fan , Bty 12 V 130 Ah , Bty 12
V 90 Ah , Bty 12 V 65 Ah , Bty 12 V 9 Ah , AVR Green , Self
starter solenoid , Armature for self starter , Alternater for
bty charge , Fuel feed pump , Carburetor , Wall Mixer Hot
and Cold single lever make Jaguar , Piller Cock 15 mm hot
and clod single lever Make Jaguar , Angle cock 15 mm Make
Jaguar , Water pump 0 point 5 HP Online Make Crompton ,
Bath Mat of size of 10 x 5 long , Concealed Ceiling round
LED light 18 W 9 x 9 , Washbasin waste pipe , Urinal wast
pipe , Door Handle As per Sample , Mortice lock 4 lever with
handle , Exhaust fan of size 6 inch , Electric Gyser cap 3 ltrs
, Vitourios China wash hand basin with complete
accessories , Jet spray for toilet seat , Looking mirror ,
Waterproof fire retardant tarpaulin of minimum size 30 x 30
ISI marked , Celing LED light 200 x 200m 18w , ACP panel
as per sample , Hydraulic oil , Plywood 8 x 4 x 19mm ,
Godrej interio plastic pulse aero mesh back office chair with
adjustable arm rests synchro mechanism black , Fevicol SR ,
Nails 1 or 2 1 1 point 5 2 , Paint Brown green white
Chocolate golden cream and black , Synthetic camonet
desert pattern size of 11m x 16m , Repairing and service of
AC , 1 Square pipe 20 Long , 1 point 25 Square pipe 20 Long
, Cement , Sand , Aggregate 20mm , Brick , Tiles 2x4 , Tiles
2x2 , Steel Bar , Water Profing , White Cement , Wall Tiles
Area 360 1x1
Closing Date8 Jan 2025
Tender AmountRefer Documents
Prasar Bharati Broadcasting Corporation Of India Tender
Goods
GEM
Bandipora, Jammu & Kashmir
Description: CATEGORY: Dismantling of old worn out Wall paneling with frame
structure of Transmitter Hall and Technical area, shifting
and disposal of dismantled debris material from the outside
of the office premises , Wall paneling treatment in
Transmitter Hall and Technical area , Providing, fabrication
and fixing of cedar or teak wooden skirting 125mm x 15mm
in Transmitter Hall and Technical area , Providing,
fabrication and fixing of cedar or teak wooden planks 75mm
x 15mm in Transmitter Hall and Technical area ,
Dismantling of old worn out false ceiling material with frame
structure of transmitter hall and technical area, shifting and
disposal of debris material from the outside of the office
premises. , Providing, fabrication and fixing of false ceiling
in Transmitter Hall and Technical area at HPT TV site Gurez
as per drawings and respective layout drawings. , Providing
of 600mm x 600mm hinged flap flushed doors and fixing it
on the ceiling as per requirement of site at Gurez ,
Providing, fabrication, fixing and polishing of wooden table
for emergency studio with console table top 25mm thick
wooden board or commercial ply with Sunmica sheet 1mm
thick , Providing, fabrication, fixing and polishing of heavy
duty wooden workshop table with top made up of 25mm
thick wood plank on top and wooden batten frame with
wooden beading and moulding , Providing and applying of
wall finish, putty and POP on walls to make smooth finish for
premium emulsion paint at Transmitter Hall and Technical
area, after touching on corners etc , Providing and applying
two coats of wall primer on gypsum false ceiling and walls
etc transmitter hall and technical area, after touching on
corners, joints and screw heads etc as required , Providing
and applying two to three coats of water based luxury
emulsion on gypsum false ceiling and walls surface ,
Wooden surface to be cleaned and wooden putty to be
applied and after rubbing with appropriate sand paper to
smooth the surface two or more coat of wooden polish to be
applied in wainscot and doors , Providing and applying of
50mm x 50mm x 12mm wooden cornice as per approved
profile at all around false ceiling in transmitter hall and
technical area , Fixing with complete wiring of 2ft x 2ft
recessed mounted LED lights , Fixing with complete wiring
of 1ft x 1ft recessed mounted LED lights
Closing Date14 Jan 2025
Tender Amount₹ 23.5 Lac
Central Railway - CR Tender
Auction
Scraps
Ireps
Corrigendum : Closing Date Modified
Maharashtra
Description: Dismantling Of Abandoned/condemned Railway Shed No. 8 Consisting Of - Columns, Base Plate, Top Plate, Truss, Cantilever, Cross Bracket, Plate/cleat, Purline, Side Angle, Cross Bracing, Angle Above Gate, Flat, Ac Sheet, G.i.sheet, Shutters. Remarks - Lot Is Approachable By Pakka Road. The Delivery Of M.s. Ferrous/gi Sheet/shutters Will Be Made On Actual Weighment Basis Only At Hbhr Depot. The Weighment Will Be Done At Hbhr Depot. The Items Mentioned In The Description Only Will Be Delivered. Delivery Of Ac Sheet (1787.3m2 (approx.) Will Be Done On As Is Where Is Basis. No Claim Will Be Entertained For Any Shortage Of Ac Sheets. Lot Number Is Exhibited/painted On The Shed. The Quantity Is Worked Out On Approximate Basis. In Case Of Excess Quantity Of Ferrous Entire Quantity To Be Lifted By The Purchaser By Payment For Difference Of Actual Quantity Delivered With Lot Quantity. Materials Like Electric Wires, Fittings & Cables And Other Such Kind Of Materials Available Inside The Shed Which Is Not Within The Scope Of Lot Description, Shall Be Handed Over By The Purchaser To Custodian. The Items Used In Fencing Around The Structure Such As Rail, Tie Bar, Jali, Stone, Bricks, Wooden Pillar Or Any Other Items And Similar Type Of Material Lying Nearby The Structure/lot Will Not Be Delivered. Dismantling & Cutting Is Allowed For Easy Loading Purpose At The Risk & Cost Of The Purchaser. Dismantling Is Permitted Upto Ground Level Only. The Purchaser Should Ensure That During Dismantling & Cutting Operation No Nearby Structure/building Should Be Affected And Take Necessary Care/safety Precautions To Avoid Any Mishap As Well As Damage To Railway Property. The Purchaser Will Be Fully Responsible If Any Accident/unusual Incident Occurs At Work Site/place During Dismantling. Extra Precaution To Be Taken If There Are Trees Near The Structure Or Its Branches Are Spread Over The Same. Train Operations And Other Railway Work Should Not Be Disturbed/affected. All Debris Should Be Cleared Before Completion Of Delivery. The Purchaser Is Advised To See The Lot Site/content Before Bidding. No Claim Will Be Entertained After Sale Of Lot. Lot Is Ok For Sale With Above Observations. Qty - Ferrous - 70.042 Mts. (approx.), G.i. Sheet - 0. 628mts. (approx), Shutter - 0.254 Mts. (approx). Total Qty (ferrous) - 70.924 Mts. (approx). Location - Wadibunder Yard. Stock Holder - Sse (works) Wadi Bunder. Note - Free Delivery Period Up To 80 Days. Note - Original Lot No. 520223101006.
Closing Date8 Jan 2025
Tender AmountRefer Documents
Central Railway - CR Tender
Auction
Scraps
Ireps
Corrigendum : Closing Date Modified
Maharashtra
Description: Dismantling Of Abandoned/condemned Railway Shed No. 10 Consisting Of - Columns, Base Plate, Top Plate, Truss, Cantilever, Cross Bracket, Plate/cleat, Purline, Side Angle, Cross Bracing, Angle Above Gate, Flat, Vertical/horizontal Angle, Vertical Strips, Y Frames, Steel Net, Ac Sheets. Remarks - Lot Is Approachable By Pakka Road. The Delivery Of M.s. Ferrous Will Be Made On Actual Weighment Basis Only At Hbhr Depot. The Weighment Will Be Done At Hbhr Depot. The Items Mentioned In The Description Only Will Be Delivered. Delivery Of Ac Sheet (2955.96 M2 (approx.) Will Be Done On As Is Where Is Basis. No Claim Will Be Entertained For Any Shortage Of Ac Sheets. Lot Number Is Exhibited/painted On The Shed. Gi Sheets To Be Returned To The Stockholder. The Quantity Is Worked Out On Approximate Basis. In Case Of Excess Quantity Of Ferrous Entire Quantity To Be Lifted By The Purchaser By Payment For Difference Of Actual Quantity Delivered With Lot Quantity. Materials Like Electric Wires, Fittings & Cables And Other Such Kind Of Materials Available Inside The Shed Which Is Not Within The Scope Of Lot Description, Shall Be Handed Over By The Purchaser To Custodian. The Items Used In Fencing Around The Structure Such As Rail, Tie Bar, Jali, Stone, Bricks, Wooden Pillar Or Any Other Items And Similar Type Of Material Lying Nearby The Structure/lot Will Not Be Delivered. Dismantling & Cutting Is Allowed For Easy Loading Purpose At The Risk & Cost Of The Purchaser. Dismantling Is Permitted Upto Ground Level Only. The Purchaser Should Ensure That During Dismantling & Cutting Operation No Nearby Structure/building Should Be Affected And Take Necessary Care/safety Precautions To Avoid Any Mishap As Well As Damage To Railway Property. The Purchaser Will Be Fully Responsible If Any Accident/unusual Incident Occurs At Work Site/place During Dismantling. Extra Precaution To Be Taken If There Are Trees Near The Structure Or Its Branches Are Spread Over The Same. Train Operations And Other Railway Work Should Not Be Disturbed/affected. All Debris Should Be Cleared Before Completion Of Delivery. The Purchaser Is Advised To See The Lot Site/content Before Bidding. No Claim Will Be Entertained After Sale Of Lot. Lot Is Ok For Sale With Above Observations. Qty - 94.038 Mts. Location - Wadibunder Yard. Stock Holder - Sse (works) Wadibunder. Note - Free Delivery Period Up To 80 Days. Note - Original Lot No. 520223101008.
Closing Date28 Jan 2025
Tender AmountRefer Documents
Northeast Frontier Railway - NFR Tender
Works
Electrical and Electronics
Ireps
Nagaon - Assam, Golaghat - Assam
Details: Description:- Supply Of Materials And Wiring Of Modular Light Point Through Concealed Wiring By 1.5
sq Mm Single Core Pvc Insulated Flexible Industrial Unsheathed Frlsh Copper Wire Through Pvc
concealed Rigid Conduit Pipe With Earth Continuity By 1 Sq Mm Single Core Pvc Insulated Unsheathed
flexible Copper Wire And Modular Type 6 Amps Controlling Switch(with Indicator Type) To Be Provided
on Good Quality Modular Plate And Frame Of Suitable Sizes And Mounting Box Of Proper Sizes.(i.e
thickness Ofmounting Boxes Of 3 Mm And Inside Width Of Box Should Be 50 Mm). All Othernecessary
accessories I.e Pvc Tee, Bend Etc Will Be Supplied By Contractor. After Concealed If Needed Than The
concealed Portion Will Be Painted By Contractor As Per Site Colour Of The Surface
Closing Date13 Jan 2025
Tender Amount₹ 52.1 Lac
Rail Coach Factory - RDF Tender
Goods
Automobiles and Auto Parts
Ireps
Kapurthala, Punjab
Details: Description :set Of Roof Panels For 3-phase Memu/tc Coaches. Coating Type Pu Paint Syst
em To Mdts-118,colour Shade To Ral-9001,matt Finish Gloss Value 10-12 At 45
degree,ventilator Duct Grill To Ral Ds 240 70 05 As Per Lno.md22151 Dated 18.06.19 & 09.
07.19. As Per Design Office L.no. Md21896 Dated 03/10/2022 Mdts-133 Rev. 05 Is Applicable I
n Lieu Of Icf/md/spec-167a Mentioned In The Drawings., As Per Drawing: Mplrpmemut3bhel V
ersion 2,packing Instruction No. Pi112 Ver2.0 [ Warranty Period: 84 Months After The Date Of
delivery ] ]
Closing Date17 Jan 2025
Tender Amount₹ 4.1 Cr
This is an estimated amount, exact amount may vary.
Delhi Development Authority - DDA Tender
Goods
GEM
South Delhi, Delhi
Description: BOQ ITEMS: Providing, installation, testing & commissioning of LED Totem pole sign board suitable for working on 220 V, 50 Hz single phase A/C supply. The display shall be made up of A.C.P. sheet (Aluminium Composite Panel) 3 mm thick of required colour and support frame of MS welded structure made out 40mm x 40mm x l.5 (NS) square pipe section with welded vertically and honzontally in regular interval with double pipe frame shall be covered from back and sides with 3mm thick ACP sheet the front facia shall be covered by ACP alongwith the letters and all the side i/c wiring the entire board with suitable size of power cable for power LED, the A.C.P. sheet shall have router cutting letters for the given matter in Hindi & English both languages and 2 & 5 mm thick acrylic sheet (NS) with the help of laser cutting of logo and letters shall be fitted inside the board for making the letters visible from outside etc. Providing inside the letter power LED modules each consisting of 3 Nos. LED of 1.14 watt, 90 lumen per watt, 12 volt, shall be fixed in such a way to give uniform bright light to the characters and 120 modules per SMPS of 400 watt capacity with inbuilt protection to make the light disturbance free. (aprox height of board 12 feet) including complete connection testing etc as required. , Fabrication, providing, welding & fixing of MS frame work made out of angle iron/ MS tube/ MS channel complete with welding and one coat of red oxide and two or more coats of approved synethic enamel paint etc. as required., Supplying and installation following size of PVC boxes IP 65, made out of poly cabrbonate outdoor installtion, weather proof, shock proof having provision for cable entry with 32 amps SP MCB, operation of manual automatic timer of 3 kw for led board and suitable connector for receiving cable with suitable mounting arrangements etc. complete as required.
(a). 350 x 270 x 190 including complete connection testing etc as required., Supplying and lying of one number PVC insulated and PVC sheathed/ XLPE power aluminum armoured cable of 1.1 KV grade of following size on wall surface as required
(a). 3 x 10 sq mm, Supplying and making end termination with brass compression gland and aluminum lugs for following size of PVC insulated and PVC shealhed/ XLPE aluminum armoured cable of 1.1 KV grade as required.
(a). 3 x 10 sq. mm (22mm) DSR_2022 (9.1.7)
Closing Date6 Jan 2025
Tender Amount₹ 9.9 Lac
Ministry Of Defence Tender
Goods
Healthcare and Medicine
GEM
Baramulla, Jammu & Kashmir
Description: CATEGORY: Lignocaine Hcl inj 2 percent without Adrenaline vial of 30ml
, Midazolam 5 mg in amp of 1 ml , Aceclofenac 100mg plus
Paracetamol 500 oblique 325mg Tab , Aspirin Soluble Tab ,
Mefenmic Acid 250mg Tab , Tab Montelukast 10 mg plus
Levocetrizine 5 mg combination , Levo Cetrizine 5mg Tab ,
Morphine Inj 15mg in 1 ml amp , Pheniramine Maleate tab of
25 mg , Lorazepam 2mg Ml Amp of 2Ml Inj , Sumatriptan tab
50 mg , Budesonide 200mcg Inhaler , Salmeterol 125mcg
plus Fluticasone 250mcg , Cotrimoxazole IP Paed 100mg
plus 20mg , Metronidazole 200mg Tab , Cefotaxime sodium
0 point , Cefotaxime sodium 250gm Inj , Cefuroxime 500
mg Tab , Clotrimazole mouth paint bottle of 15 ml ,
Ciprofloxacin 500mg tab tinidazole IP 600mg , Flucanozole
150 mg , Amikacin sulphate100mg , Inj Amoxycillin 500mg ,
Cefotaxime , Ondansetron inj 8mg Amp , Inj Heparin 5000 iu
oblique ml , Tranexamic acid Inj 500 mg oblique 5ml ,
Tranexamic acid Tab , Gel Choline Salicylate , Mannitol 20
precent Inj Bott of 100ml , Fenofibrate Tab 200 mg ,
Isosorbide Dinitrate tab 10 mg , Isosorbide 5 Mononitrate
tab 20mg , Torsemide 10 mg Scored , Adenosine Inj 3 mg
oblique ml Amp of 2 ml , Adenosine Inj ml 10 ml ,
Amiodarone HCL 150 mg ml Inj in 3 ml amp , Lignocaine
HCL solution 2 percent for IV use vial of 50 ml , Atenolol Tab
25 mg , Labetalol HCL Tab 100 mg , Metoprolol Tarterate
Tab 50 mg , Metoprolol Inj 1 mg percent ml amp of 5 ml ,
Propranolol Tab 40mg , Digoxin Tab 0 point 25 mg , Digoxin
Inj 0 point 5 mg in amp of 2 ml , Tab Metoprolol XL 25mg ,
Asprin Tab 75 mg , Clopidogrel tab 75mg , Tab Aspirin
150mg , Amolodipoine besylate Tab 5 mg , tablet
Hydrochlorothiazide 25mg , Tab Telmisartan 40 mg ,
Frusemide plus Spironolactone Tab , Labetalol H C L Inj 4ml
amp , Ramipiril 5mg Hydrochlorothiazide12 point 5mg Tab ,
Metoprolol 12 point 5mg Tab
Closing Date13 Jan 2025
Tender AmountRefer Documents
Department Of Defence Production Tender
Goods
Healthcare and Medicine
GEM
Gurdaspur, Punjab
Description: CATEGORY: BRIVARACETAM 50MG TAB , LEVOSULPIRIDE 25MG TAB ,
AMOXYCILLIN 500 MG PLUS CLAVULINIC ACID 125 MG TAB ,
INJ TT TETANUS TOXOID 5 ML , TADALAFIL 10MG TAB , INJ
NANDROLONE DECANOATE 25MG by ML , XYLOMETAZOLINE
10 ML NASAL DROP , HEPARIN 15G OBLIQUE 20G OINT ,
ANASTRAZOLE 1 MG TAB , BRIMONIDINE 0POINT2
PERCENTAGE WPERV EYE DROPS , OXCARBAZEPINE 150 MG
TAB , TAMSULIN 0POINT4 MG PLUS DUTASTERIDE 0POINT5
MG TAB , PAROXETINE 12POINT5MG TAB , SYP PERACTIN
CYPROHEPTADINE , FLUCONAZOLE 150 MG CAP , LEVOFLOX
500 MG TAB , DOMPERIDONE 10 MG TAB ,
ACEBROPHYLLINE 100 MG TAB , NORFLOX 400MG TAB ,
QUETIAPINE 25 MG TAB , DOTHIEPIN 75 MG TAB ,
OLANZAPINE 10 MG TAB , NEBIVOLOL 5 MG TAB ,
ARIPIPRAZOLE 10 MG TAB , BETADINE GARGLES ,
CARBIDOPA 25PLUS LEVODOPA 250 MG TAB ,
CHLORHEXIDINE MOUTH WASH 2PERCENTAGE BOTT OF 100
ML , DESMOPRESSIN ACETATE NASAL SPRAY 1 MCG BY ML
BOTT OF 5 ML , DILTIAZEM 60 MG TAB , GLUCO STRIP
ACCUCHECK ACTIVE PACK OF 50 , INSULIN SYRINGE
DISPOSABLE , LAMOTRIGINE 50 MG TAB , NITROFURANTOIN
100 MG CAP , PANCREATINE MINIMICROSPHERE WITH
LIPASE 25000 CAP , PRAZOSIN SR 5 MG TAB , RIVASTIGMINE
1.5MG CAP , STERILLIUM 500 ML BOTTLE , CALCIUM
ACETATE 667 MG TAB , MEBEVERINE 200MG TAB ,
TETRABENZEME 25MG TAB , THIOCOLCHICOSIDE 8 MG TAB
, INJ DICLOFENAC 25MG ML 3ML , PAROXETIN 25 MG TAB ,
ZOLPIDEM 10 MG TAB , ED BRINZOLAMIDE PLUS
BRIMONIDINE , DETTOL 500 ML BOTTLE , PIRFENIDONE 200
MG , ALPHA LIPOIC ACID PLUS CHROMIUM PLUS FOLIC ACID
METHYLCOBALAMIN PLUS SELENIUM PLUS ZINC , SODIUM
VALPROATE 500 MG TAB , CETRIZINE 5MG PLUS
PARACETAMOL 325MG PLUS PHENYLEPHRINE HCL 5MG , INJ
ADRENALINE 1 RATIO 1000 1 ML , NORMAL SALINE FLUID
SODIUM CHLORIDE 0 POINT 9 PERCENTAGE 500 ML ,
DEXAMETHASONE 4MG TAB , NICORANDIL 5 MG TAB ,
PROPRANOLOL TR 40 MG TAB , Stollen Gum Paint , Syp
Disodium Hydrogen Phosphate bott of 100 ml , Tab
Orciprenaline 10mg , Evening Primosa 500 mg , SYP
LACTULOSE 200 ML
Closing Soon27 Dec 2024
Tender AmountRefer Documents
Indian Army Tender
Goods
Healthcare and Medicine
GEM
Jammu, Jammu & Kashmir
Description: CATEGORY: Tab Clopidogrel 75 mg , Tab Dexamethasone 4 mg , Tab
Ibuprofen 400 mg , Tab Fluconazole 400 mg , Tab
Domperidone , Tab Albendazole 400 mg , Tab Aciyclovir 400
mg , Tab Chymoral Forte , Tab Azithromycin 250 mg , Tab
Cefixime 200 mg , Tab Atorvas 20 mg , Tab Aspirin 150 mg
, Tab Norflox TZ , Tab Levocetrizine 5 mg , Tab Cetrizine 10
mg , Tab Naproxen 250 mg , Tab B Complex , Tab Digene ,
Tab Fexofenadiene , Tab Montelukast , Tab Ondansateron 4
mg , Cap Pregabalin 75 mg , Tab Gabapentin , Tab Mecoba
1500 mcg , Tab Alprazolam 0.25 mg , Tab Amlodipine 5 mg
, Tab Cipzox , Tab Biotin , Tab Pantop 40 mg , Cap Omez 20
mg , Tab Diclofenac 50 mg , ORS , Tab Augmentin 1 gm ,
Tab Metronidazole 400 mg , Tab Doxycycline 100 mg , Tab
Nitrofurantoin 100 mg , Tab Metformin 1 gm , Tab Shelcal ,
Cholecalciferol Sachet , Inj Pantop , Inj TT , Inj Diclofenac ,
Lignocaine 2 percent gel , Mupirocin , Soframycin 30gm ,
Choline Salicylate and Lignocaine Oral Gel , Clobetasol , No
Piles , Povidone Iodine Gel , Clotrimazole Cream ,
Permethrin Cream 5 percent , Normal Saline Nasal Drop ,
Clotrimazole mouth Paint , Clear Wax Ear Drop , Sucralfate ,
Tab Paracetamol 500 mg , Tab Combiflam , Tab Ferrous
Sulphate Folic Acid 5 mg , Syp Iron , Syp Amoxycillin , Syp
Albendazole , Syp PCM 125mg per 5ml , Eye Drop CMC , Eye
Drop Ciprofloxacin , Multi Vitamin Drops 15ml , Isabgol Husk
3.5gm Sachet , Knee Cap , Crepe Bandage 15cm , Spray
Volini , Tab Cough Lozenges , Inj Neurobion , Syp Lactulose ,
Keto Conazole Shampoo , Skinlium Nb , Lacto Calamin
Lotion , Neosporin Powder , Lumbar Belt Medium , Lumbar
Belt Large , Corn Cap , Cough Syrup , Pulse Oximeter ,
Chlorhexidine Mouthwash , Interdental Floss , Fluoride
Toothpaste , Betadine Gargles , Anti Hypersensitivity
Toothpaste , Diclofenac Gel , Band aid strips , SSD ,
Ketoconazole shampoo , Suncream 50 PPF , Tab Piroxicam
20mg , Cap Itraconazole 200 mg , Tab Cyproheptadine 4
mg , BP Apparatus , Tab Enalapril 2.5 mg , Tab Sitagliptin 50
mg , Tab Tamsulosin 0.4 mg , Tab Sumatriptan 50 mg ,
Sterile Surgical Gloves , Face Mask N 95 , Hand Sanitizer ,
Clindamycin Oint
Closing Soon27 Dec 2024
Tender AmountRefer Documents
2141-2150 of 2174 active Tenders