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THIS IS A JACOBS 14N BALL BEARING SUPER CHUCK, A SPECIALIZED TOOLING ACCESSORY FOR DRILL APPLICATIONS. THE UNIT FEATURES AN INTEGRATED JACOBS AO303 ARBOR, DESIGNED FOR A DUAL CONNECTION STANDARD OF NO 3MT AND 3JT. THE OPERATIONAL CAPACITY OF THE CHUCK ALLOWS FOR TOOLING DIAMETERS RANGING FROM 0 TO 1/2 INCHES, WHICH IS EQUIVALENT TO 0 TO 13 MILLIMETERS. THIS SPECIFIC MODEL, IDENTIFIED BY PART NUMBER 14N, IS SUPPLIED COMPLETE WITH A K3 KEY.