Made In the USA.Meets Federal Specifications GGG-V-410, Type IV.60,000 PSI tensile ductile iron cast bar & back, Large pounding anvil surface, Replaceable Hardened Steel Pipe Jaws, Self-adjusting pipe jaws designed to grip pipe securely, Pipe jaw design helps prevent pipe marring, crushing or bending, Pipe jaws are recessed to allow for machinist’s vise use, Deep throat for extra working room, Interlocking Swivel Base With 360 Degree Motion equipped with two (2) Lockdowns, No Pinch Main Screw Handle, Replaceable Hardened Steel Serrated Jaws, Continuous Rolled Thread on Main Screw.