Reduced fatigue on the user and the machine because Tri-Cuts are up to 20% lighter weight than standard single spur augers. * Smooth, consistent holes with minimal blowout for a clean hole with every cut. * 7/16" shank with quick-change power groove for easy bit changeover. * Perfectly concentric design, which is guaranteed through the tightly-controled heat-treat and hardening processes, means that the hole cut will be exactly true to the diameter of the bit.