"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. Double Lock-Downs No, Jaw Width in. 4 1/2, Replaceable Jaw Yes, Jaw Depth in. 4 1/2, Jaw Capacity in. 7, 360 Swivel Base No, Pipe Jaw No. 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"