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