[Package content]- 12 Pcs 2.1mm Drill Dia High Speed Steel straight shank twist drills.. [Strength and Hardness]- Made of high-speed 6542 steel, rock wall hardness grade HRC 63-66. With titanium coating treatment, it is reliable and durable.. [Professional and DIY use]- Suitable for hardened materials and hard metals, such as cast iron, hard plastics, and also suitable for soft materials. When it cannot penetrate, try to adjust the RPM.. [Twisted Design]- With a 120 angle point and twist design, it can increase the cutting speed through automatic centering; avoid displacement during the work process, and at the same time remove debris and particles faster and easier. The straight shank can be firmly fixed and accurately centered, suitable for standard drill chucks and conventional round chucks..
