Jacobs Precision Keyless Drill Chucks.
Self-tightening feature increases holding force when torque increases.
Certified to .0016" TIR at 1/2".
For more information about chucks, arbors, and Morse or Jacobs Taper dimensions, please visit our Drill Chuck Mounting page, which can also be found in our "Metalworking Reference" section of this website.
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