Grizzly H8260 Keyless Chuck with Integral Shank, 1/2-Inch Precision keyless drill chucks have integral shanks to fit a variety of spindles including mores taper r8 and cat 40 each chuck has a knurled grip of Each chuck has a knurled grip for plenty of torque and if that's not enough they're spanner wrench compatible (spanner wrench not included