Grizzly G9866 - 8" 4-Jaw Plain Back Independent Chuck
"Independent" means that each jaw moves independently. Such 4-jaw chucks are used for holding odd shaped pieces or where zero tolerance is required. This 4-jaw chuck has a semi-steel body and hardened reversible jaws. Requires a mounting plate. Note the mounting holes are through the front of the chuck. This is because each jaw moves independently and there is no scroll in the middle. Bore: 2 3/4"