Apexstone 2pcs 100N/22.5LB 15inch Gas Spring/Prop/Strut/Shock/Lift Support with L-type Mounts Force:22.5 Lbs/100 N(Per Strut),Length (Center-to-Center):14.96 inch(380 mm),Compressed Length (Center-to-Center):9.06 inch(230 mm).Bracket Holes' Size: 8 mm(diameter),8 mm(diameter),10 mm X 8 mm(Length X Width) 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 20 and 32 inch , the WEIGHT is between 18 and 35 lbs If you want to open the lid at 90-120 degrees, the mounting point on the lid is at the 120-130 mm(4.72-5.12 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 75 mm(2.95 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 and Screws NOT included,if you are not sure the item is okay for your project , please contact us before placing order We offer 1 YEAR 100% SATISFACTORY WARRANTY, if unfortunately our item did not work well ,please kindly contact us for exchange, refund or return