8T8 Replacement Office Chair Gas Lift Cylinder - Heavy Duty Standard Size Pneumatic Piston Extension 5.5 inch (Black 140) HEAVY DUTY - 8T8 replacement gas lift cylinders are made of high quality metal construction, support more weight and pressure than other original standard gas cylinders UNIVERSAL STANDARD SIZE - 2 inch bottom base and 1.1 inch cylinder shaft fit most executive, office, computer and desk chairs Hold the maximum weight over 700 lbs and lift the height to 2-10.3 inches(Adjustable ranges: 50, 65, 85, 100, 120, 140, 160, 180, 200, 260mm), as well as allow for 360 degrees quietly swiveling Easy to install: Both cylinders' edges are slightly tapered for easily installing, you can use your home repair kits simply to remove the old cylinder and install the new cylinder There are 10 Sizes and 2 Colors (Black/White) of office chair gas lift cylinders for your choosing, please just rest assured to purchase what you need as we promise providing friendly customer service