Apexstone 45N/10lb 10 inch Gas Struts,Gas Strut,Lift Support,Gas Shocks,Lid Stay,Set of 2 Force:10 Lbs/45 N(Per Strut),Length (Center-to-Center): 9.84 inch(250 mm),Compressed Length (Center-to-Center):6.49 inch(165 mm),Set of Two in the Package Ideal for supporting the door/lid to keep it open,Support opens lids to a maximum angle of 150 degrees,it fit for the door/lid which the SIDE LENGTH is between 15.75 and 27.5 inch , the WEIGHT is between 6 and 11 lbs.If you are not sure the item is okay for your project,please contact us before placing order If you want to open the lid at 90-120 degrees, the mounting point on the lid is at the 55-65 mm(2.16-2.56 inch) to the hinge's direction.If you want to open the lid at more than 120 degrees, the mounting point on the door is at the 42 mm(1.65 inch) to the hinges direction.If you feel the it's too powerful, you can move the mounting point 20 mm(0.79 inch) towards the hinges's direction ,while if you feel it's too weak,you can move it 20 mm(0.79 inch) towards the opposite direction Instructions NOT included, Screws NOT included We offer 1 YEAR 100% SATISFACTORY WARRANTY, if unfortunately our item did not work well ,please kindly contact us for exchange, refund or return