The Milwaukee 2-1/6 in. 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 in. hex shape is compatible with 2-1/6 in. Die stocks or for use with wrenches. Engineered for durability, the Milwaukee 2-1/6 in. 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.