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HHIP 3 jaw zero-set self-centering lathe chuck is made of high grade tool steel. It features semi-steel run true "0" set. Hardened and ground to the highest T.I.R. 0.0005" repeatability. Two piece top and Master jaws are American standard Tongue and groove. 2PC top jaws can be reversed for clamping and jamming.0005" repeatability on duplicate parts fine adjustment plain back opposing adjusting screws for "dead true" accuracy. Product specifications: chuck dia.: 6; (inch) center hole: 1.520; T.I.R.: 0005 max. Rpm: 3,400; wt. (Lbs): 26; D: 6"; D1: 3.15; H: 0.69; a: 2.35; b: 1.50; z-d: 6-m6.