Straight Flute Hand Tap , 5/16-18 , Plug , 4 Flutes, UNC
-18, UNC, Plug, Overall Length 2 23/32 in, High Speed Steel, Black Oxide, Right Hand, Thread Length 1 1/8 in, 75 Percent Thread Drill Size F, Thread Limit H3, Class of Fit 2B.Straight Flute Tap, Thread Size 5/16 In.