1. Size Cutting edge diameter 9/16 inch, shank diameter: 1/2 inch, cutting length 3 inch, compact and lightweight for easy carrying, suitable for various materials. Package includes: 3 x reduced shank drill bits. 2. MATERIAL The drill bits are made of M35 speed steel containing 5% cobalt, resulting in higher hardness. M35 speed steel drill bits offer exceptional wear resistance, making them effective for machining hard materials and metals. The nitrided black surface treatment enhances corrosion resistance and wear resistance, effectively extending their lifespan. 3. 135Degree Split Point Provides machining stability, suitable for harder materials, effectively reducing the risk of edge chipping, thereby improving drilling efficiency and hole quality. 4. Versatile Applications: The drill bits feature red hardness and wear resistance, making them suitable for hardness materials such as steel, alloy cast iron, stainless steel, iron, copper, aluminum alloys, and cast iron. They are also effective for use with plastics and wood.