Walter Surface Technologies Drillco® Nitro Heavy-Duty Mechanic's Length Drill Bit Set, 29 No. of Pieces, High Speed Steel (350NW29)

Drillco® Nitro Heavy-Duty Mechanic's Length Drill Bit SetManufactured from a premium grade of M-7N molybdenum high speed steelThe Nitro Heavy-Duty 135° Split Point Drill with a Nitride surface treatment that gives a hard protective layer to the drill (increases hardness without increasing brittleness) which is measurably harder than high speed steelBody and clearance are gold and black surface treated for maximum lubricityRecommended for use in stainless steel and other hard metal drilling