The strongest black titanium, heat resistant, abrasion resistant, and durable in the industry. Using the highest quality cobalt high speed for long lasting drilling. Spiral blade shape for outstanding sharpness. Can be used with an impact screwdriver. Deburring, expansion and chamfering. Center punch work is not required. The unique spiral blade shape makes cutting speed far faster than conventional straight blades. The main body material is made of the highest quality HSS-CO steel (Cobalt Highs). Superior abrasion and heat resistance compared to HSS steel. The shank part has a 6.35 hex axis for use with an impact driver and charging drill. The tip is thinned for an outstanding bite. One can drill, enlarge, and chamfere various sizes. Laser measurement markings will ensure that the hole dimensions are not fade.