Feature: Easy to install with simple hand tools in just few minutes. The gas springs are powerful, can support small,medium to heavy object. Such as car window, car bonnet or car tailgate. With easy fittings to any surface, just attach and lift, your gas spring lifts and holds any weight's object. This gas spring is universal, which fits for RV window, car hood and trunk, pickup truck tonneau cover, tailer cover, bus luggage door, motorcycle seat cover and so on. Specification: Material: Metal Color: Black Placement on Vehicle: Rear Pickup Truck Tonneau Cover Force: 80lbs Extended Length:910mm /36" Compressed Length:511mm /20.11" Total Length: 922mm / 36.30" Rod Length: 399mm / 15.70" Housing Diameter: 22.1mm / 0.87" Connecting Rod Diameter: 10mm / 0.40" Note:If the temperature is lower than minus 20 degrees, the oil density of the gas spring turns high (frozen) and it is difficult to press down.Package Included:2pcs Gas Struts