"This Yost Heavy-Duty Industrial Machinist Bench Vise is forged from 65,000 PSI tensile ductile iron for twice the strength of regular cast iron. Flat base installs easily and is stationary for rock-solid mounting. U.S.A. 360 Swivel Base No, Double Lock-Downs No, Jaw Capacity in. 12, Pipe Jaw No, Replaceable Jaw Yes, Jaw Depth in. 8, Jaw Width in. 8. 65,000 PSI tensile ductile iron body parts Furnished with machined flat base for easy mounting No-pinch main screw handle Replaceable hardened steel serrated jaws Continuous rolled thread on main screw Conforms to Fed. Spec. GGG-V-410B Type VI Class 1"