[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 use Colour:Black Material:iron Size:15x22cm Package Contents: 1 x Chair Tilt Control Mechanism Only 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.