Yost Vises 204 4" Machinist Vise with 360-Degree Swivel Base Bench-mount machinist vise with swivel base, 4" nominal jaw width, and extra-large jaw opening and throat depth provides clamping action for heavy-duty applications 360-degree swivel base adjusts the direction of the jaws for proper placement and locks in place Ductile iron body is durable and strong for extended life Jaws are grooved for enhanced grip and can be replaced when worn Meets Fed. Spec. GGG-V-410B Type VI Class 2 specifications and is made in USA