The IRWIN Record T3TON3VS Workshop Vice, with Anvil and Swivel Base 4in, is specifically designed for medium-duty workshop applications for both the professional craftsman and the DIY enthusiast. Strong and durable, the body and sliding jaw, width 100mm, are cast from close grained grey iron which is machined on all friction surfaces for a smooth reliable action. The jaws, handle and main screw are steel. The main screw has a two-start rolled acme thread to speed the jaws from fully closed to fully open with a minimum of winding. Specification: Jaw Width: 100mm (4in) .