Irwin stone drill bits are the most efficient and durable on the market. Thanks to the carbide tips, their usability and efficiency are guaranteed on all stone materials. The flute tip is shaped to cut the material aggressively, ensuring 15% faster drilling speed compared to normal bits. The unique soldering process makes the connection between the bit and the shank super strong. The single flute structure lets the bit remove chips 60% more efficiently than similar products. Carbide tipAggressively cutting tipUnique soldering processSingle flute structure