Design features a machined work surface. The main screw and nut are totally enclosed to keep out dirt and eliminate wear. Straight line pull through the bar and the body greatly reduces wear on main vise nut. Mid-line vises are imported and have replaceable, hardened steel jaw facings and replaceable pipe jaws which are serrated and heat-treated. The base swivels 360° and has two swivel base locking clamps with toothed engagement.