Milwaukee 3-Flat Secure-Grip hammer-drill bits drill faster and last longer than others on the market. The 3-flat secure-grip shank fits in all 1/2 in. three-jaw hammer-drill chucks and maintains unyielding bit hold with heavy torsional loads. Designed especially for conical anchor, concrete screw, nail-in and hollow wall anchor applications, the bit provides superior performance through its reinforced flute geometry and Carbide tip design. Milwaukee offers a complete range of 3-flat secure-grip hammer-drill bits in diameters from 1/8 in. to 1 in. with lengths up to 18 in.