There is increased awareness of dust extraction, so if you’re drilling concrete get the best solution with the Makita SDS-Max Dust Extraction Drill Bit (B-63909) which combines efficient concrete drilling with efficient dust extraction. The bit features dust extraction holes so when used with a rotary hammer and dust extractor, it offers drilling and hole cleaning in one step, and reduces airborne silica dust. Makita SDS-Max dust extraction drill bits are an OSHA table 1 compliant solution when used in conjunction with approved control devices. The bit features a solid carbide head for added strength and durability. The 6/4/6 design consists of 6 front cutters, 4 side cutters and 6 side stabilizers for a total of ten cutting edges. Added features include a self-centering tungsten carbide tip to help drive the bit straight.