Replacement Short Office Executive Chair Gas Lift Cylinder Pneumatic Shock - Short Size - 3" Travel / Adjustment Range - S6103 2" wide - will fit most chair bases 7.25" wide black lower support column (larger diameter black tube) 3" of piston travel / stroke (up & down) 12" (307mm) total overall length when fully extended Ideal to replace shorter gas cylinders on most office chairs and executive chairs, including those purchased at office supply stores