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 an R8 to JT3 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.