Klein Tools 53402 Ship-Auger Bit with Screw Point, 3/4-Inch Bit by 4-Inch Twist Length 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 Head and twist are ground to correct clearance for easy removal from hole Feed-screw pilot draws bit into wood Full length is heat-treated and tempered