THIS JACOBS 14N IS A BALL BEARING SUPER CHUCK DESIGNED FOR HIGH-PRECISION DRILLING APPLICATIONS. THE TOOL FEATURES A 3JT ARBOR CONNECTION AND IS SPECIFICALLY CONFIGURED WITH A CAT 50 HOLDER FOR MACHINE INTERFACE. IT PROVIDES A RELIABLE DRILLING CAPACITY RANGING FROM 0 TO 1/2 INCHES, EQUIVALENT TO 0 TO 13 MILLIMETERS. THE PROPER FUNCTIONING AND TIGHTENING OF THIS JACOBS 14N CHUCK REQUIRES THE USE OF A K3 CHUCK KEY.