The Milwaukee 2-1/6” Hex Threading Dies are precision machined for creating or repairing clean, accurate (external) threads. The Hex Dies feature long-lasting laser-etched sizing for the clearest markings and include a protective Black Oxide coating for corrosion resistance. The large 2-1/6” Hex shape is compatible with 2-1/6” Die stocks or for use with wrenches. Engineered for durability, the Milwaukee 2-1/6” Hex Dies are designed for cutting threads in the most common metal applications including brass, aluminum, mild steel, and more. For best results, use Hex Dies with cutting fluid.