2-1/4″ x 7/16″ Shank.
Designed for high speed cutting of large holes in all woods, fiberglass and drywall. Commonly used for pipe or conduit placement. The wide throat allows fast chip removal with no clogging. The Quick Change shank has two recesses to allow for a tight fit when using extensions. Molybdenum coated for cooler running which causes bit to last longer. Each bit comes with a 7/16″ shank, replacement self-feed tip and a hex wrench. Clearer throat ejects chips more effectively.