THIS JACOBS 16N 3JT BALL BEARING SUPER CHUCK IS A SPECIALIZED PIECE OF TOOLING CLASSIFIED UNDER DRILLING ACCESSORIES. THE BALL BEARING SUPER CHUCK DESIGN UTILIZES A 3JT ARBOR AND IS EQUIPPED WITH A CAT 50 HOLDER FOR SECURE MOUNTING AND INTEGRATION. IDENTIFIED BY THE PART NUMBER 16N, THIS CHUCK ACCOMMODATES A TOOLING CAPACITY RANGE FROM 1/8 INCH TO 5/8 INCH, WHICH IS EQUIVALENT TO 3 MM TO 16 MM. A KEY IS INCLUDED AS PART OF THE COMPLETE ASSEMBLY.