Switchblade Selfeed bits are designed for drilling holes in all types of wood for pipe, vents, gas lines, and bulk wire routing. This innovative replaceable blade system provides maximum productivity by eliminating downtime and the cost to resharpen. Aggressive feed screw design allows the bit to pull through the wood faster, resulting in faster drilling. Replacement blades are made with hardened steel to increase bit life. Each bit comes standard with a second replacement blade allowing the bit to cut like new again. Available in the sizes that plumbers, HVAC contractors, and electricians use most frequently. Size and model number are engraved on each bit. Includes: (1) Switchblade Selfeed bit, (2) replaceable blades, (2) feed screws, (2) set screws, and (1) hex wrench.