<b>NOTICE: This vice is very heavy. Please double-check the dimensions provided below and in the photos to be sure it will work for you before ordering. Return shipping may cost you half the price of the vise!</b><br><br>1. Use highest quality ductile Iron 80000 PSI for minimum bending. <br /> 2. The enclosed lead screw and sliding surface are harden and ground. <br /> 3. Highest clamping power. It's very accurate and durable. <br /> 4. This vise is so designed that the horizontal force generated by tightening the handle pushes the semi-sphere within the movable jaw and thus thrusts the movable jaw downward. The workplace does not move up, even if it is held at the top of the jaw plates. <br /> 5. Four setting positions of the jaw plates are available, widening the jaw plates opening. <br /> <br /> Model - 15979 <br /> Jaw Width - 3.93" <br /> Jaw Opening 3.93" <br /> Jaw Height - 1.26" <br /> Base Height - 1.3" <br /> Weight - 37lbs / 17kg