HHIP 3/16-3/4 in. JT3 Drill Chuck with Key This drill chuck is accurate & has strong gripping force. The taper mounted chuck is used for portable, bench or floor type drill presses and is supplied with chuck key. This set also contains a MT4 to JT3 tang end drill chuck arbor. The included arbor is hardened and ground. There is also a 2 piece JT3 drill chuck removal wedge set. This 2 piece set is used to remove taper mount chucks from arbors or spindles.