Milwaukee 3/8"-16 NC Straight Flute Plug Tap & 5/16" Drill Bit features a precision machined Plug Tap designed to create or repair clean, accurate internal threads. This set includes the matching drill bit for piloting, ensuring a fit every time. The Plug Taps are laser-etched with long-lasting sizing for clear markings and coated with protective Black Oxide to resist corrosion. The square shank is compatible with all standard tap handles or wrenches and is built for through-hole threading. Engineered for durability, these Straight Flute Plug Taps efficiently cut threads in common metals such as brass, aluminum, and mild steel. The included drill bit is optimized for use with drill drivers. For optimal performance, use the Plug Taps with cutting fluid. Model Number: 49-57-5548