New line of F-Series vises provides a better and more durable vise that is ruggedly built and designed to last a lifetime. It's the only vise good enough to carry a lifetime warranty against jaw breakage. Forged Steel construction and hardened for long life. 2 times tougher than cast iron, 20% stiffer! Oversized jaws provide greater clamping and working surfaces. Extra long jaw guides provide greater jaw opening to handle larger work pieces. Forged Pipe jaws clamps pipe and rod securely. Forged steel swivel base with dual draw down bolts allows vise to be locked in any position. 3 mounting holes securely fix vise to work surface. Cold rolled double acme thread screw provides straight line pull and faster adjustment of jaw opening; enclosed to keep debris out of threads and mechanism.