"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. Replaceable Jaw Yes, Jaw Width in. 3 1/2, Double Look-downs No, Pipe Jaw No, 360 Swivel Base No, Jaw Capacity in. 4, Jaw Depth in. 4. 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"