Description:【Steel Chassis】: Control the again of the backrest and the raise of the seat cushion to fulfill the purposes of other sitting postures. The hardness of high energy alloys is guaranteed.【Function】: Backrest carry adjustment knob, back adjustment handle, carry adjustment handle.【Easy to Remove and Install】: Even non experts can set up this accessory.【Solid Interface】: Heavy Duty Office Chair tilt management back and forth, gas cylinder height activation,Can be twisted to tighten or loosen backward tilt tension【Replacement Mechanism Tilt Control】: Fits maximum gaming, government and workplace swivel chairs. Great for replacing and repairing the old swivel chair. Make the outdated chair reusable and stronger.Specification:Material: Steel Size Chart:Style A: Width: 21.5cm/8.46inchStyle B: Width: 17cm/6.69inch, Installing Hole Distance: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 allow slightly errors thanks to guide dimension and diversified monitors.