Hausted HSS Series Surgical StoolFeatures: Foot controlled hydraulics with three spindle base and Four 3 inch (8 cm) dual Tente1 casters for greater stability 360o rotating urethane arm rest for comfort Adjustable contoured back rest Comfort seat with proprietary Dura Gel insert for enhanced comfort Choice of three seat styles to meet surgeons needs: wedge, saddle and water drop 180o arm rest support for more stable arm positioning Adjustable height range 21 28 inches (53 71 cm)