-20, UNC, Modified Bottoming, Overall Length 3 7/32 in, High Speed Steel, Diamond, Right Hand, Thread Length 9/16 in, 75 Percent Thread Drill Size #7, Thread Limit 2B, Class of Fit 2B.Straight Flute Tap, Thread Size 1/4 In.
50 mm, Thread Limit H7, Class of Fit 6H, Number of Flutes 3.-24, UNF, Overall Length 2 29/32 in, HSS-E, Black Oxide, Right Hand, Thread Length 11/16 in, 75 Percent Thread Drill Size 8.Spiral Point Tap, Thread Size 3/8 In.