Cut your own faceplate for a favorite chuck or have an extra plate for mounting a 4-jaw chuck in addition to the standard 3-jaw chuck. Or just use it as a blank plate on which to bolt a fixture or project. The plate is blank so you can customize it to your needs. Center mount is 1.5" x 8 tpi or 1.125" x 12 tpi. Please be sure to match against your dividing head to guarantee fit.