Ridgid 37820 Pipe Die 37820 Dies, 12R 3/8 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: 3/8-18 Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool.