Bosch Speed-X™ Rotary Hammer Drill Bit, 2 Flutes, Spiral Flute, SDS-Max Shank, Right Hand Cutting, Applicable Materials: Concrete, Brick, Stone and Other MasonryBosch Carbide Rotary Hammer Bits Feature Tips That Stay Sharper Longer and Deliver More Holes Within Specification Than Competitive Bits. Manufactured to ANSI Specification B212.14. SDS-Max® Rotary Hammer Bits Fit Bosch SDS-Max® Hammers and Competitive SDS-Max® Drive Hammers and Hilti® Hammers Using Te-Y and Te-Fy Shanks. Unrivaled Power From Solid Carbide Head with Robust S-Cutter Design For Added Speed and Life.