9/16″ Ship Auger Bit Screw Point 15″ LFeaturesShanks are 7/16” hex to fit 1/2” (13 mm) and larger three-jaw chucks.Full length is heat-treated and tempered.For heavy construction and repair work in mines, on docks and bridges as well as electrical work.Feed-screw pilot draws bit into wood.Special bit steel with machine-ground flutes and polished edges for smooth, wobble-free boring.Bits drill through nails, wood, vinyl, plastics, and heavy timber.Head and twist are ground to correct clearance for easy removal from hole.Deep, open throat design clears chips for faster, cleaner cuts.