⌈18.5 inch Gas Strut⌋Extended length: 18.50 Inch, Compressed length: 11.25 Inch. 45 Lb / 200 N per strut, 2 PACK. Package information: 18.50 inch 45 lbs gas prop strut X 2; ⌈Applicable Scenario⌋Lift-o-mat spring strut lift for A.R.E Leer camper shell, pickup truck cap topper, canopy glass door, back window, bed cover, replacement shocks, etc. ⌈Replacement⌋Interchange Part number: 525045, C16-21706, GS525045, GSNI-5200-45, GSNI-5250-45, SE185P45, SPD520045, SPD-5200-45, SPD-5250-45. ⌈NOTE⌋If the weight and the pressure of the gas strut do not match, the gas strut may not work properly, please select the appropriate gas strut according to the original part number and pressure value. The gas struts can not be compressed by hands before installation!!! ⌈Don't Worry⌋PAMAGOO will provide you with professional customer service BOTH before and after your purchase and offer 18-MONTHS support service. Pamagoo Gas Spring Struts: Need to prop open a door, cabinet, barrier, or even a car?Your gas struts are construction grade and do all the heavy lifting so you can focus on the real work.Easy Fit & Removal: Plates fitted to each end of your gas springs can easily be fitted and removed to any surface. Best Uses: leer camper shell struts pamagoo gas struts spring accessories canopy shell window springs lift support gas shock back struts for a.r.e. camper truck captruck cap gas struts truck topper partsFeatures: safe and smooth So, What’re You Waiting For? Let your new gas springs do the heavy lifting for you while you can crack on with the job at hand, unhindered and well-executed, click "Add To Cart" Now!