EASY REMOVAL & INSTALLATION - The only chair cylinder replacement on Amazon to offer a cylinder removal tool. No more struggling and spending hours trying to remove your chairs old broken cylinder with tools you don't have. We will also make sure to help guide you through the entire process from start to finish. SAVE MONEY. REVIVE YOUR CHAIR - Fix your sinking office chair by replacing the cylinder instead of spending money on a brand new computer chair. We'll send you the highest quality cylinder on the market, our exclusive cylinder removal tool, detailed step-by-step installation instructions, gloves, and our money-back guarantee. You have nothing to lose! INDUSTRY STANDARD SIZE - This pneumatic piston cylinder will fit almost every office chair on the market including herman miller aeron. The cylinder has a 1-1/8" (28mm) diameter piston shaft and a 2" (50mm) diameter column. If it doesn't fit your specific chair, no problem, we'll take care of you. EXTRA HEAVY DUTY - Our desk chair