Milwaukee 4-36 NS Straight Flute Plug Tap is precision machined to create or repair clean and accurate internal threads. This plug tap features long-lasting laser-etched sizing for clear markings and is coated with protective Black Oxide to resist corrosion. Its square shank fits all standard tap handles or tap wrenches and is specifically designed for through-hole threading. Built for durability, it is i for cutting threads in common metals such as brass, aluminum, and mild steel. For optimal performance, it is to use this plug tap with cutting fluid. Model Number: 49-57-5107