[Function] — This Set of 2pcs lift supports gas prop shocks could be used as the replacement struts or DIY modification struts for ARE ATC Snugtop Canopy Leer Camper Shell Window Truck Topper Cap and Home-built Cabinet House Lid ; Interchange number: C16-04154, C160415454 [Specification] — Pair (2 total) of 24 pound (each) gas struts ; Force: 24 lbs/214 N per shock, 48 lb/428 N per set; Extended Length A [in]: 14.45 (between two holes), Compressed Length B [in]: 8.98 (between two holes) [How to Contact us?] — If you have any issues about the product quality, fitment or missing parts, click “ASK SELLER” besides your order from us, best solution will be offered directly within 24 hours, without returning the package to us! [Application Range] — Measurement needed first for the size of your old struts! If your application weighs about 10-15lbs, one shock will hold perfectly; if your application weighs about 20-40lbs, you could install two shocks, adjust the mounting point on the lid 0.79inch towards/opposite to the hinge direction could change the lift pressure to weaker/stronger! [Installation] — Exact fit original equipment design ensures easy installation; if you want to install them on DIY builds, you need to buy mounting bracket; if you install them as the OEM replacement struts, just use a screwdriver to remove the old set and then install the new set ; Note: Lift Supports couldn’t be COMPRESSED by hands before installing!!!