For safer and more accurate drilling, the DELTA 20-622 4-inch Drill Press Vise lets you clamp the materials you"re working on securely to your workbench. With a quick release that lets you adjust to various sized workpieces with a quick and simple sliding of a tightening screw, you"ll be able to get things done faster. A final tightening can be done with a turn of the crank handle. The vise features cast iron construction, and has slots so you can mount it to drill press tables. The jaws of the vise are 4-inch wide, and are pre-drilled for auxiliary jaw plates.