Irwin Tool 3046003 18" Self-feed Wood Bit Extension
For drilling large diameter holes in wood for pipe, conduit and other applicationsReplaceable coarse screw point drills quickly in dry, wet, and gummy woodAll bits have a 7/16" hex quick change impact shank that fits 1/2" or larger electric drills or 7/16" hex impact wrench drillsPrecision milled shank eliminates runout and wobbleForged in one piece from high carbon steel for maximum strength under tough drilling conditionsIdeal for pipe and conduit systems