1. Made to accept gas lift 2.Seat height adjustable 3.Tilting lock and unlock, in any angle 4.Adjustment lock nut, back heih YR-019 tilt mechanism with one lever for seat height adjustment,with back forward function too.office chair tilt mechanism:1. Made to accept gas lift2. Seat height adjustable3. Tilting lock and unlock, in any angle4. Adjustment lock nut, back height can be adjusted up and ...