Irwin Tools 45312ZR Boring Machine Auger Bits, 3/4" x 8" Boring Machine Auger Bits Round shank is designed for use in power drills, drill presses and boring machines with 1/2'' or larger chuck Full-length heat treated bit guards against bending in heavy-duty applications and strengthens the twist where the greatest strain occurs Heavy stem increases strength and rigidity while reducing vibration. Shank length is 2'' Medium-fast screw point ideal for general wood boring applications