Feature:1. Wide Application: Suitable for drilling various materials such as die steel, I‑beam, channel steel, ordinary steel, angle iron, aluminum, copper, wood and stainless steel within 1‑3mm.2. 3 Section Design: 3‑section stepped design, the shank diameter is controlled within 12.7mm/0.5in, suitable for drill chuck within 13mm/0.51in.3. Durable Construction: High speed steel material, high strength, not easy to rust, safe and durable to use, ensure fast execution in any material for clean results.4. High Accuracy: ground with geometry of 135 degree split point for quick penetration and accurate start‑up. Improve work efficiency.5. Long Service Life: Surface black layer, anti‑oxidation treatment, holds up better lubrication for smoother drilling. Withstand heavy duty operation for a long tool life.How to Use:1. If the drilled material is too hard, first use a 3‑6mm drill bit to make small holes, and then use a large drill bit to ream the holes.2. The rotation speed of the electric drill for drilling hard objects should be between 80‑120 for the best effect.3. Because stainless steel contains more alloy components, its hardness and mechanical properties are higher. When drilling with a hand drill, you need to apply enough pressure and the motor power is large enough. It is easier to use a bench drill.4. Add coolant or cutting fluid to&n