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. The bit features dust extraction holes so when used with a rotary hammer and dust extractor (sold separately), 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 (sold separately). the bit features 3 cutting edges for maximum performance, rebar resistance and more accurate holes. There are 3 135-degree cutting edges that are engineered to help prevent cracking of the surrounding concrete, and 3 120-degree supports between each edge to provide more accurate holes. Added features include a self-centering tungsten carbide tip to help drive the bit straight.