"The Yost Heavy-Duty Industrial Machinist Bench Vise with Swivel Base is forged from 65,000 PSI tensile ductile iron for durability and longevity. Interlocking swivel base ensures that the vise will not rotate once locked down. Continuous rolled thread on main screw enables easy opening and closing of the vise. U.S.A. Pipe Jaw No, Double Lock-Downs Yes, Replaceable Jaw Yes, Jaw Capacity in. 4, Jaw Depth in. 4, Jaw Width in. 3 1/2, 360 Swivel Base Yes. 65,000 PSI tensile ductile iron body parts Interlocking swivel base bench vise with 360 motion 2 lockdowns 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 2"