• 3.00" OD x 13.63" O/A Lg (retracted) • Includes: Cylinder, 1/4-20 x 1-3/4” lg. stainless steel socket head cap screw and Threadlocker 242 (RPI Part #RPA032) • Uses Hydraulic fluid (RPI Part #RPF449) Fits: Between Baseplate and Upper Structure of Chair