The best SwitchBlade assortment for the professional plumber. The 5-piece SwitchBlade plumber’s kit contains 4 of the most common self-feed bit sizes (1-3/8′, 1-1/2′, 2-1/8′, 2-9/16′), 4 feed screws, 4 set screws, 4 replacement blades (1-3/8′, 1-1/2′, 2-1/8′, 2-9/16′), 1 hex wrench, and a 5-1/2′ x 7/16′ Universal Quik-Lok extension. Aggressive feed screw design allows the bit to pull through the wood faster, resulting in a faster drilling. Replacement blades made with hardened steel increases bit life. Size and model number are engraved on each bit. The durable, compact carrying case makes it easy-to-transport from 1 location to the next. Removable storage case included.