Ridgid 37825 Pipe Die, Pack of 4 37825 Dies, 12R 1/2 Npt This item is used for Handtools & Tool Organizers ,Other Hand Tools This product manufacture by United States Die material/type: alloy RH Nominal pipe size - threads per inch: 1/2 to 14 Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool