The 7-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. The 7-Piece Kit includes hammer-drill bits sized (2) 1/4 in x 4 x 6 in , (2) 3/16 in x 4 in x 6 in , 3/8 in x 4 x 6 in , 5/16 in x 4 in x 6 in , and 5/32 in x 4 x 6 in .