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Product Description IRWIN Flexible Installer Bits with Carbide Tip or Type M tip are ideal for drilling in tough materials. They are designed with a Tungsten carbide tip for extended life when drilling in brick, block and mortar joints. These bits are made with a hole in the flute for easy wire pulling through walls, ceilings and floors. They have a 3-flatted shank to prevent slipping in drill chucks and the shank also includes a hole for wire pulling. The bit is designed with a tapered flute for faster debris removal which delivers less binding and smoother drilling. Plus, the bits are made from premium high carbon steel for extended drilling life. From the Manufacturer IRWIN Flexible Installer Bits with Carbide Tip or Type M tip are ideal for drilling in tough materials. They are designed with a Tungsen carbide tip for extended life when drilling in brick, block and mortar joints. These bits are made with a hole in the flute for easy wire pulling through walls, ceilings and floors. They have a 3-flatted shank to prevent slipping in drill chucks and the shank also includes a hole for wire pulling. The bit is designed with a tapered flute for faster debris removal which delivers less binding and smoother drilling. Plus, the bits are made from premium high carbon steel for extended drilling life.