For use in drilling application where small nails and other foreign materials may be encountered. Single twist type with single cutter and side lip. Hollow center twist, medium-fast screw pitch, heat- treated full length. . Guaranteed consistent Rockwell ha rdness. Cutting head can be sharpened. For deep boring work in large timber, telephone and power poles, on docks and bridges, in mining and heavy construction. 17" overall - 12" twist. |