Jacobs 30221 - 0-1/2" x JT3 Ball Bearing Drill Chuck
Ruggedly constructed for high stress applications, these heavy-duty chucks utilize ball thrust bearings to reduce heat and friction under extreme working conditions - while increasing gripping force and drilling accuracy. Through-hardened sleeve teeth, nose and keyholes for added durability. Jaws are center-ground for increased accuracy.
0-1/2", JT #3