The angled clamping screw on moveable jaw of our Precision Toolmakers Vise exerts downward force that keeps workpiece from lifting out of proper alignment. Precision ground on all surfaces. Clamps to milling table. Jaws are 2 inches wide x 1 inches deep. Opens to 3-1/4 inches. Overall height 2-3/16 inches. Base plate is 6 inches long. Includes V-grooves for round workpieces and threaded hole for mounting stops and other fixturing.