Straight Flute Tap, Thread Size 1/4 In. -28, UNF, Semi-Bottoming, Overall Length 2 1/2 in, Cobalt, Black Oxide, Right Hand, Thread Length 5/8 in, 75 Percent Thread Drill Size 5.45 mm, Thread Limit H3, Class of Fit 2B. This item has been restricted from sale in the following state (s): []