Heavy duty cast steel construction.Powerful, replaceable serrated steel. jaws provide maximum gripping and clamping power.Integrated, internal pipe jaw for clamp round tubing and pipe.Chrome plated, cold rolled steel worm gear screw.Chrome plated sliding T-bar handle and lock down nuts.360 degree Swivel locking base.Large, polished steel anvil.3 Bolt down slots for securing to work benches.