Makita's professional HSS COBALT DIN 338 cylindrical twist drill bits are milled, ground and equipped with a self-centering split point. With a hardness of 65-66 HRC and a bronze finish, these drill bits are designed to offer optimum performance. The 130° self-centering sharpening ensures superior precision. Ideal for use on metal, mild steel, non-ferrous metal, stainless steel, sheet metal, pipes and aluminum profiles.