This premium quality, Non-OEM Replacement Gas Lift Cylinder is made to fit only the Herman Miller Equa I chair. It will not fit any other chair model. Cylinder Dimensions: Piston stroke / travel height adjustment range of 5" (up & down)Overall length from end to end when fully extended is 15.6"Overall length from end to end when fully compressed is 10.6"Width of piston is 28mm (1.10") Pin activation button style Attachment hardware included: washers, bearing kit, & retaining clip FREE SHIPPING **** Note -This Non-OEM gas cylinder is made only to fit the Herman Miller Equa I chair ******** Does NOT fit other chairs or versions ****