THIS ITEM IS A JACOBS 6A – 33 TAPER BALL BEARING CHUCK, MANUFACTURED BY JACOBS, FEATURING A 2MT JACOBS CHUCK ARBOR. IT IS A BALL BEARING TYPE CHUCK WITH A 6A – 33 TAPER SPECIFICATION. THE CHUCK HAS A CAPACITY OF 0–1/2IN. THE OVERALL LENGTH (OAL) OF THE ENTIRE PIECE, INCLUDING THE ARBOR, IS 6–3/4IN.