Milwaukee 5/8"-18 NF SAE Straight Flute Plug Tap is your go-to solution for creating or repairing clean, accurate internal threads. Precision machined and built to last, this plug tap features long-lasting laser-etched sizing for clear markings, ensuring ease of identification. It comes with a protective Black Oxide coating that provides excellent corrosion resistance, enhancing durability. The square shank is compatible with all standard tap handles or tap wrenches and is specifically designed for through-hole threading. Engineered to tackle the most common metal applications including brass, aluminum, and mild steel, this plug tap delivers reliability and performance. For optimal results, it is to use cutting fluid for smooth threading operations. Model Number: 49-57-5171