Irwin 4935570 Auger Drill Bit, 7/16 in Dia, 17 in OAL, Twist Flute, 1-Flute, 3/8 in Dia Shank

The Irwin with WeldTec" 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.