The highest quality U.S. materials and craftsmanship go into producing the Multi-Vise. The body is constructed of tough, 50,000 psi tensile strength, ductile, iron, which makes it last and last. Precision-machined, smooth, jaw faces combine firm pressure with a gentle finesse to securely hold metal, wood, or plastic. The 4140, chrome-moly-steel, nickel-plated, rust-resistant lead screw turns effortlessly. Mfg: Brownells SPECS: Cast iron body, precision-machined, green paint. Jaws are 3 1/2" (9.0cm) x 2 1/2" (6.3cm), opens to 5" (12.7cm). 1 3/4" (4.4cm) square anvil. 18 lb. (8kg) wt.