Description:【Steel Chassis】: Control the back of the backrest and the elevate of the seat cushion to fulfill the needs of other sitting postures. The hardness of excessive energy alloys is guaranteed.【Function】: Backrest raise adjustment knob, again adjustment handle, lift adjustment handle.【Easy to Remove and Install】: Even non professionals can install this accessory.【Solid Interface】: Heavy Duty Office Chair tilt management again and forth, gasoline cylinder peak activation,Can be twisted to tighten or loosen backward tilt tension【Replacement Mechanism Tilt Control】: Fits most gaming, government and office swivel chairs. Great for changing and repairing the outdated swivel chair. Make the old chair reusable and stronger.Specification:Material: Steel Size Chart:Style A: Width: 21.5cm/8.46inchStyle B: Width: 17cm/6.69inch, Installing Hole Distance: 20cm/7.87inchStyle C: Width: 21.5cm/8.46inch, Installing Hole Distance: 17.3cm/6.81inchStyle D: Width: 21.5cm/8.46inch, Installing Hole Distance: 17.5cm/6.89inchStyle E: Width: 11cm/4.33inchStyle F: Width: 17cm/6.69inch, Installing Hole Distance: 20cm/7.87inchPackage Includes:1x Office Chair Tilt Mechanism ReplacementNote:Please enable slightly errors because of guide measurement and diverse monitors.