Irwin stone drill bits are the most effective and durable stone drill bits on the market. Thanks to the carbide tips, their lifespan and efficiency are guaranteed on all stone materials. The flute tip design 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 flute 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