Good stability, high safety and explosion protections. Made of stainless steel and ABS, which offers outstanding impact resistant, the solid construction is designed to against corrosion, which is very . Suitable for general office chairs, chairs, computer chairs. Features -Color:Grey -Material:Stainless steel, ABS -Size:55.00X5.00X5.00cm/21.61X1.97X1.97in -Stretched length: 55cm -Note:The tube height of 200# is 30cm -Strengthened stainless steel lifting , smooth and silent lifting. Suitable for the most office chairs. -Heavy duty gas lift cylinder can support enormous weight, high center of chair support column. -The length of the chair cylinder can extended to suitable for most of your office chairs, with reliable performance - performance, workmanship, safe and reliable. Easy to install without additional screws -This gas lift is suitable for most executive office chairs, work chairs, office chairs, rolling stools, drawing stools Package list: 1 x Gas Lift Cylinder