Pipe Tap, 1/4-18, Taper, 4 Flutes, NPT
-18, NPTF, Overall Length 2 7/16 in, High Speed Steel, TiN, Right Hand, Thread Length 1 1/16 in, 75 Percent Thread Drill Size 7/16 in, Thread Limit H4, Number of Flutes 4.Pipe and Conduit Thread Tap, Thread Size 1/4 In.