chairpartsonline Replacement Gas Lift Cylinder Pneumatic Shock - Fits Herman Miller Equa I Chair - Non-OEM S2681 Premium quality replacement gas lift cylinder made to fit only the Herman Miller Equa I chair - Non-OEM *** Does not fit other chairs Piston stroke / travel height adjustment range of 5" (up & down) Width of piston is 28mm (1.10") Overall length from end to end when fully extended is 15.6" & 10.6" when fully compressed Attachment hardware included: washers, bearing kit, & retaining clip