IRWIN 3043009 Auger Bit Auger Bit, Twist Flute, 12 in L Flute, Quick-Change Impact Shank, 7/16 in Dia Shank             The IRWIN with WeldTeca,,c ship auger is made stronger and lasts longer than any ship auger in the world. It features a welded cutting edge that easily cuts through tough materials like nail-embedded wood. It has twice the nail cutting life of standard ship augers. With an aggressive screw-pitch for faster drilling, this bit is fully-forged for maximum durability and wide flutes provide maximum chip removal with less binding.