Black Iron Press Jaws and Rings were designed for use on Viega MegaPress Fittings and provide a faster alternative to threading and roll grooving to connect 1/2 in. - 1 in. Schedule 5-40 Black Iron Pipe. Milwaukee's Rings have a unique dual pivot design which provides superior close quarter access and are up to 30% lighter than the leading competitor. Milwaukee Black Iron Press Jaws and Rings provide exceptional access and superior productivity when used with the M18 Force Logic Press Tools.