DeWALT DW5424 Hammer Bit Drill Bit, Helix Flute, 4 in L Flute, SDS Plus Shank, 5/16 in Dia Shank               Sets up to 25% more anchors than standard masonry bits, DeWALTA(R) SDS Plus masonry drill bits power through masonry, concrete and more with a carbide tip that maximizes bit life. An elongated 4-flute helix helps to increase material removal and 3 flats on the shank helps to prevent slippage.