[ Precision Sizing ]: Force: 178 N/40Lbs 7.5 Inch per Strut, a pair of 2 shocks. Extended Length: 7.50", Compressed Length: 5.25". Fit the lid lengths 11-15 inches. And your project weight is 32-44 lbs for the pair struts [ Interchangeable and Wide Compatibility]: Interchage Number: 1716UQ,4535BV,8195582,C1615046,CS75040,ML1140,ML3140,NI290040,NI490040,SE200A40,SG459009,SL1140,SL11401,SL11405,SL3140,SL31401,SL31405,SPD290040,SPD490040,SX075P40 , small shock for camper/rv /kitchen cabinets, toy box, truck tool box, rv storage, gun box, hatch, boat, garbage bin cover, and other light lid so on [Easy to install and Safety]: Just grab a flathead screwdriver and follow the instructions, ,then complete a project in under 5 minutes. CANNOT compress directly by your hands [ Durability ]: Our products are suitable for various weather environments such as outdoor heavy rain and minus 104℉. Carbon steel and QPQ baking paint process prevent leaks and corrosion [ What You Get ]: 2 x Gas Struts, 4 x mount bracket, 10 x screws, 1pc x installation guide. IAQWE offers 12-months support and 24-hours online. As a excellent and reliable gas shock manufacturer, IAQWE always stand behind you to provide you with the stronger support tool box gas struts for lid 7in gas shocks lift supports master lift gas struts tool box hydraulic arms master-lift gas struts replacement parts for keter storage