12+1 Month Product Service: welcome to click "ask seller" beside your order for in-time assistance if any problem occursTruck Tonneau Cover Lift Support: 28 inches 250 Lb/1112 N Heavy Duty Lift support compatible with pickup bed tonneau cover, undercover, truck bed coverInterchange Number: 100250, 100-250, 10478, 12162, 3100250, 3100-250, 8195619, AC10250, AC10250 2383, AVM 100250, AVM 100-250, C1621770A, C16-21770A, GS3100250, SE1000250ME, SE1000-250ME, SPD3100250, SPD-3100-250, ST280M250. If you can't find the interchange number, please measure the length from the center of the socket to the center of the socket before purchasingFor DIY Project: For DIY projects, E.G., RV outside Door, RV Cabinet Door, Heavy-duty Trap Door, Outdoor TV Cabinet, Shed Window. Please measure the size, length, width and weight of the project before choosing. 28in 250 lb gas strut work for items with sides approximately 60 inches long and lid weighing 240-250 lbsProduct Parameter: Extended Length: 28.00 inch. Compressed Length: 16.50 inch. Connection: Ball Socket (Steel)=13mm. Force: 250 lb per strut. Strong enough!! You couldnt compress it by your hand