FeaturesHeavy Duty Office Chair tilt control back and forth, gas cylinder height activation,Can be twisted to tighten or loosen backward tilt tensionUniversal SizeTilt control mechanism fit for most chairs cylinder,is great for replacement and upgrade for almost all mesh chair, ergonomic office chair, desk chair and task chairPremium Grade ReplacementThis chair lift control give your chair , Stable use, tilt control no noise.Easy to Use twist wheel to tighten or loosen (adjust) backward tilt tension. Push lever to tilt, pull out to unlock.FunctionSingle lever for gas cylinder height activation, accepts standard 28mm inner diameter tapered gas lift cylinders.Specification:Material: SteelSize Chart:Style A: 27.8cmx17.5cm10.94inchx6.89inchStyle B: 24.7cmx17.5cm9.72inchx6.89inchPackage Includes:1 Piece Office Chair Tilt Control MechanismNote:Please allow slightly errors due to manual measurement and different monitors.