Replacement Drafting Stool Gas Lift Cylinder Pneumatic Shock - Full Stool Height - S6120 2" wide column diameter will fit most chair bases 14.5" (315mm) black support stand pipe column height (larger size black tube) 10" (270mm) piston stroke with 28" (708mm) total overall extended length Drafting stool height Ideal to replace gas cylinders on most tall task chairs, drafting chairs, and stools, including those purchased at office supply stores.