Uxcell 6542 High Speed Steel Twist Drill Bit Fully Ground Black Oxide 4.9mm Drill Dia 85mm Total Length 5Pack

Uxcell 6542 High Speed Steel Twist Drill Bit Fully Ground Black Oxide 4.9mm Drill Dia 85mm Total Length 5Pack 1. Made of high-speed steel with great toughness and hardness not easy to break easy chip removal the drill quenching treatment improve the hardness of use. Surface black oxide treatment not easy to rust. 2. This twist drill is proper for electric drill hand electric drill and impact electric drill. Suitable for Stainless steel iron copper aluminum alloys wood plastic drilling and carving. 3. Spiral flute design for quick cleaning of chips. The sharp cutting edge provides a smooth cut without glitches. Chip removal is not easy to stick to the tool. 4. Adapt to several kinds of cooling conditions for example oil mist water oil air cooling.