100% Satisfaction Satisfaction Guaranteed. 9 Inches to 13 Inches Office Chair Cylinder Replacement 4 Stroke Heavy Du. New: A brand-new, unused, unopened, undamaged item in its original packaging where packaging is.. 10.87×2.32×2.28 Inches. 2.28 inches x 10.87 inches x 2.32 inches. Weight: 2.29 lb. ?? Adjustable Height 4 inches? The compressed length is 9.88 inches (251mm), the fully expanded length is 13.6 inches (346mm), sinking length is 1/2 (15mm), Stroke Length is 3.7 inches, which allows your chairs to rise higher. ?? Universal Fit Size for Most Chairs? The outer column cylinder diameter connected to the base is 2 inches (50mm), and the piston shaft diameter connected to the chair is 1-1/8 (28mm). This pneumatic piston cylinder will fit almost every office chair on the market including herman miller aeron. Not compatiable with 1KEA and some other brands. ?? Upgraded Class 4 Gas Cylinder? Mastery Mart’s office chair cylinder replacement is made of premium steel. This heavy-duty gas lift cylinder is manufactured to meet the highest industry standard (BIFMA/ANSI), the lift has a maximum capacity of up to 1000 LBs. ?? Eliminate Sinking Concerns? Prevent sinking issues by removing the old cylinder using a hammer or wrench. Simply assemble our new cylinder into the base and attach the seat. Our office chair lift provides seamless 360-degree rotation. Your satisfaction is our priority. We offer the best prices around on high quality products. Our E-store includes media such as books, movies, music and games while offering electronics, toys, sporting apparel, clothing, tools, general home, garden items and more. We are always working hard to ensure your package arrives as soon as possible. We do not accept P. Please provide a physical address. We try over very best to make sure every customer is completely satisfied. If there’s a problem, message us! We’re happy to help.