Power Drill Power Pole Auger Bit, 9/16 in X 29 inSingle spur, cutter, and side lip design bore through creosoted poles without clogging, binding, or stopping to clear chips Extra long twist is ideal for boring large poles, construction timbers, and for multiple timber applications All bits feature 7 16 in adaptable hex shank Simply remove it to use round shank Full length heat treatment guards against bending in heavy duty applications and strengthens the twist where the greatest strain occurs