WITH INTEGRAL SHANKS Features: .Integral shank design is more compact than a combined drill chuck and arbor, resulting in greater accuracy and rigidity as well as a larger work envelope. .Self-tightening (clockwise rotation only). .Precision balanced. MODELChuckShankMaxCapacityTypeRPMKC2MT-1/21/32-1/2"2MT7,000KC3MT-1/21/32-1/2"3MT7,000KC4MT-1/21/32-1/2"4MT7,000KCR8-1/21/32-1/2"R87,000