The M18T ProPEXr Expansion Heads are precision engineered for accurate expansion of Uponorr PEX-a tubing for ProPEXr fittings. Featuring the auto-rotation interface for Milwaukee Cordless ProPEX Expansion Tools, the heads are not only compatible with M18T Tools, but also fit most Uponor cordless tools. Made from high strength steel, the chrome plated segments and black oxide ring combine durability and weather resistance. Color coded rings for easy size recognition add convenience.