Straight Flute Tap, Thread Size 5/8 In.-18, UNF, UNJF, Taper, Overall Length 3 13/16 in, High Speed Steel, Bright (Uncoated), Right Hand, Thread Length 1 13/16 in, 75 Percent Thread Drill Size 14.50 mm, Thread Limit H3, Class of Fit 2B, 3B