Pipe and Conduit Thread Tap, Thread Size 1/4 In. -18, ANPT, NPT, Overall Length 2 7/16 in, High Speed Steel, Black Oxide, Right Hand, Thread Length 1 1/16 in, 75 Percent Thread Drill Size 7/16 in, Thread Limit H5, Class of Fit Not Applicable, Number of Flutes 4. This item has been restricted from sale in the following state (s): []