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 great 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.