3/8" Diameter, Brad Point Drill Bit, 3-7/16" Twist Length, Overall Length 5-1/4", Provides Accurate Positioning For Starting The Hole, Bit Is Precision Ground For Use In Furniture Making, Doweling, Cabinetry, Where Exact Hole Size Is Required, Spur Cutting Edges Reduce Splintering & Ensure A Smooth, Clean Hole, Wide Flutes Provide A Fast Continuous Flow Of Chips, Pouched.