A heavy-duty machinist vise built to withstand the toughest of maintenance and production requirements. Constructed of high tensile malleable cast iron and machined to close tolerances to assure secure clamping at any opening. Built for performance and endurance to handle your work holding needs. Available in either stationary or swivel base models. Moveable 45,000 PSI malleable cast iron, nut, and main body castings. Hardened replaceable steel jaws. The slide bar serves as extra-large anvil work area