Black oxide twist drill bits for metal, wood and plastic. The collection includes a Milwaukee THUNDERBOLT 1/8" black oxide drill bit and a 21 piece THUNDERBOLT black oxide drill bit set.
Black oxide coating reduces friction and resists rust, a good general purpose choice for mild steel, sheet metal and wood. For hard or stainless steel, a cobalt bit will last longer. Buy a set to cover common sizes and single bits for the sizes you use and break most often, such as 1/8" pilot holes.
