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Jacobs 33BA drill chuck with K32 key, mounted on a threaded MT3 / Morse Taper #3 arbor. Keyed Drill Chuck, Medium Duty, Bearing Type Plain Bearing, Key Number K32, Closed Length 3.09 In, Open Length 2.43 In, Chuck Diameter 1.79 In, Capacity Max. 0.500 In, Capacity Min. 0.08 In, Construction Steel