Swivel chair (DIVA SIC024/020) Backrest height adjustment. The height of the backrest (lockable in 3 positions) can be adjusted by up to 60 mm with a single hand movement; Depth-adjustable lumbar support ensures optimal forward curvature of the backrest upholstery; Fully adjustable seat depth. With a single click the seat depth can be increased by up to 50 mm; 3D adjustable armrests with soft polyurethane pads. Height and depth adjustable. The arms rotate 30°; Synchro mechanism. Synchro mechanism lockable in 5 positions, with anti-shock system and body-weight adjustment; Tilt tension adjustment. The seat tension can be properly adjusted depending on the person’s weight; Base. Polished aluminum or plastic base with fiberglass; Casters for soft or hard floors, ø 65 mm; 3-years warranty.