RIDGID 66987 F-45 Forged Vise, 4-1/2-inch Bench Vise All-steel, 75,000-PSI tensile strength drop-forged steel construction for superior durability; sleek, rugged design out-performs bulky cast-iron versions Patented parallel jaw alignment system for precise clamping action and longer service life; 4-3/4-inch (120 mm) jaw opening Steel handle with rubber anti-pinch rings and a high-performance rolled double lead Acme screw Features surface-hardened slides for smooth, precise operation; large hardened anvil Sturdy forged steel swivel base with dual draw-down bolts; adjustable swivel base allows vise to lock securely in any position