Nitro Heavy Duty - 3 Flat Shank Drill Bits
The Nitro Heavy Duty 135° Split Point drill with Nitride surface treatment, that give a hard, protective layer to the drill (increases hardness without increasing brittleness), which is measurably harder than high speed steel. Body and clearance are black and gold surface treated for maximum lubricity. Recommended for use in stainless steel and other hard metal drilling.