Ridgid 37965 Manual Pipe Threader Die, Alloy, Right Hand, 3/4-Inch NPSM 37965 Dies, 12R 3/4 Npsm This item is used for Handtools & Tool Organizers ,Other Hand Tools This product manufacture by United States 3/4" Nominal Pipe Size 14 Threads Per Inch (NPSM) National Pipe Straight Mechanical Used for OO-R, 111-R, 12-R, O-R, 11-R Ratchet threaders Also used for 30A, 31A 3-way pipe threaders