The 5-Piece 3-Flat Secure-Grip™ Milwaukee® Hammer-Drill Bit Set delivers superior quality in a range of the most useful bits on the jobsite. 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" 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 bits provide superior performance through reinforced flute geometry and the carbide tip design. Milwaukee offers a complete range of 3-Flat Secure-Grip Hammer-Drill Bits in diameters from 1/8" to 1" with lengths up to 18".