The 3/8 in. High-Speed Steel Step Drill Bit from Kreg features a one-piece design that eliminates clogging and provides a much smoother and faster drilling stroke than stepped drill bits with replaceable center augers. This specialized stepped bit is made of high-speed steel and features a 3/8 in. Dia that can be used in any Kreg jig. It creates 1-9/16 in. long pocket holes so you can join pieces of wood with pocket-hole screws. WARNING! Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood. Wide-diameter portion of bit creates a flat-bottomed hole while narrow-diameter portion creates a channel for screw shank Designed for use with Kreg Jig Master System, Kreg Jig K5, Kreg Jig K4, Kreg Jig R3 and Kreg Jig Mini Provides a smooth, fast drilling stroke; fashions a pocket hole 1-9/16 in. long Requires minimum chuck size of 3/8 in.