This precision milled, Large Keyless Chuck has a 0 to 3/4" capacity. A large diameter knurled body provides plenty of hand torque for tightening and if that’s not enough, three 5/16" diameter holes are provided for use with a spanner wrench (not included). Overall size is 2-3/4" diameter x 5" long.
See page 343 of our 2009 Grizzly Catalog!