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