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 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