Titanium Carbo-Nitride (HSSE-TiCN) coated drill bit variety pack has a specialized coating that is extremely hard to keep its cutting edge sharper longer when used on harder steels.
Kit includes 5 bits total: one 6x70 mm, three 8x80 mm, and one 10x90 mm longer drill bit for chuck style drill.
Premium grade drill bits are manufactured from a high grade Molybdendum high speed steel, that has high vanadium content. Performance drill bits are salt nitride treated, actually penetrating the...