[Features]Heavy Duty Office Chair tilt control back and forth, gas cylinder height activation,Can be twisted to tighten or loosen backward tilt tension[Universal Size]Tilt 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 chair[Premium Grade Replacement]This 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.[Function]Single lever for gas cylinder height activation, accepts standard 28mm inner diameter tapered gas lift cylinders.The product appearance slightly from batch to batch, but it does not affect the useColour:BlackMaterial:ironSize:15x25cmPackage Contents:1 x Chair Tilt Control MechanismOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.