Compared to other masonry bits, Irwin® SpeedHammer Power™ masonry bits are manufactured with twice the carbide in the tip for longer life when drilling in rebar reinforced concrete. Manufactured with premium steel, these bits are optimized for cutting through concrete at high speeds. The flute has an outer groove that quickly removes dust and efficiently dissipates heat, increasing drilling speed and extending the overall life of the bit. Irwin® Masonry Drill Set, Rotary, Series: SpeedHammer Power™, Imperial System of Measurement, 1/4 in Minimum Drill Bit Size, 1/4 in Maximum Drill Bit Size, 5 Piece, Specifications: Right Hand Cut, 6 in L SDS-Plus® Shank, Steel, Bright