RIDGID 47765 Threading Machine Dies, Right-Handed High-Speed NPT Pipe Dies with Nominal Pipe Size of 1/2-Inch to 3/4-Inch for Universal Die Heads Fits RIDGID NPT universal machine die heads 504A, 711, 713, 811A, 815A, 816, 817 and 842 High-Speed threading die for stainless steel Threading dies have capacity of 1/2-inch to 3/4-inch Right-Hand, NPT (National {American} Pipe Tapered) thread RIDGID 47765 NPT dies have 14 TPI (Threads Per Inch)