Step Drill Bit 3-13MM, Metal Drill Bits HSS Cobalt Step Bit for Metal, Multiple

Material High Speed Steel (HSS 4241). YOKOCUT step drill bit HSS M35 with cobalt added coating. HSS combined with a cobalt added coating. More capable and durable. Not suitable for hard and brittle materials such as stainless steel, glass, tile floors, walls etc.

eBay