JACOBS 3A CHUCK & K3 KEY

For medium or heavy-duty portable, bench or floor-mounted power tools • Exceptionally high accuracy, gripping power and durability • Wide range of capacities for use on threaded and taper-mounted spindles • Jaws treated to ensure thread life and high gripping surface hardness • One-piece sleeve • Fluted sleeve standard except model TB844, which is smooth and ground • Models TB839 and TB846 are equipped with a positive drive slot • Models TB840 and TB847 are equipped with a pin-type positive drive