Ridgid 50070 M12 International Standards Organization High Speed Dies 50070 Dies, 500B 12Mm X 1.75 Iso Hs This item is used for Hand tools & Tool Organizers ,Other Hand Tools This product manufacture by United States International Standards Org For use with 531, 541 and 500B 1/4"-1" Die Heads RH High Speed M12 rod size 1.75 thread pitch