[OEM Direct Replacement Part] Interchange number: C1633313, C1620651, SE187P40, SE187P40S10 [Common Uses] For ARE, Leer, SnugTop truck cap & camper shell windows, food truck window, hot tub cover, snugtop & truck cap & topper accessories parts. Quick tip: Always confirm your part number and dimensions for a hassle [Details Parameters You Need] Extension length (hole to hole): 18.70 inch, Compression length (hole to hole): 10.82 inch, Force: 40 pound 178N(fit lid 32-44lb). Connector hole diameter 10mm, gas strut thread diameter 6mm [Living Safer] No more hit head from the lid [3-minutes Installation] Just pop off old strut with screwdriver; bolt on new one. Done [Package content] 2 x 18.7in 40lb gas struts, 1 x guidebook [Customer First Principle] 18 months replacement support. no more wasting time and money for maintenance The 18-inch, 40-pound gas strut supports lids measuring 24-36 inches wide and weighing 32-44 pounds. It reduces the effort required to open the lid and maintains the lifting force to keep it open, freeing the operator's hands. Primarily used for toolbox and camper shell windows.