DeWalt® spline shank bits are designed to stand up to the hardest aggregate and drill holes fast. The four cutter heads reduce vibration for less user fatigue. The concave head and double flute design allows dust to be removed from the hole quickly for reduced breakage. DeWALT® Guaranteed Tough® High Impact Carbide™ 4-Cutter Masonry Drill Bit, 4-Cutter, 1-3/4 in, 22 in Overall Length, 17 in Cutting Depth, 4 Flutes, Spiral Flute, 17 in Flute Length, 3/4 in Shank, Spline Shank, Rock Carbide® Point, Right Hand Cutting, Carbide Cutting Edge, Steel, Bright, Silver, Applicable Materials: Concrete and Masonry