IRWIN Flexible Installer Bits with Screw Tip feature a Type B tip or screw tip with an aggressive pitch that delivers easy starts and fast drilling. 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 chip ejection which delivers less binding and smoother drilling. Plus, the bits are made from premium high carbon steel for extended drilling life in wood. From the Manufacturer IRWIN Flexible Installer Bits with Screw Tip feature a Type B tip or screw tip with an aggressive pitch that delivers easy starts and fast drilling. 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 chip ejection which delivers less binding and smoother drilling. Plus, the bits are made from premium high carbon steel for extended drilling life in wood.