The Ken-Tool Industrial Duty Bench Vise is made from high-strength Austempered ductile iron, providing durability and long-life use. Its micro-grooved, replaceable steel jaws has a hardness of HRC45-56. The pipe jaws provide a solid grip on pipe and other rounded material. Features a 360 degree swivel base, and a U-shaped collar screw design for wear-resistance and smooth operation. These vises have 4”, 5”, 6”, and 8” jaw widths. Gear-type locking system with double lock-down bolts locks vise securely in position.