Replacement Office Chair Gas Lift Cylinder Pneumatic Shock - 5" Travel - S6111 2" (50mm) wide x 9.25" (235mm) tall black center support column (larger black column) that will fit into most standard chair bases 5" piston stroke / travel adjustment range (up & down) 16.25" total overall length from top to bottom when fully extended Ideal to replace gas cylinders on most standard office chairs, task chairs, executive chairs, and more. Black