Irwin Tools 46812 Power Drill Power Pole Auger Bits, 7/16" Shank, 3/4" Diameter, 17" Total Length, Single,IRWIN,46812" /> Power Drill Power Pole Auger Bits Single 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'' adaptable hex shank Simply remove it to use round shank