Spiral Point Tap, Thread Size 1/2 In.-20, UNF, UNJF, Overall Length 3 3/8 in, High Speed Steel, Bright (Uncoated), Right Hand, Thread Length 1 21/32 in, 75 Percent Thread Drill Size 11.40 mm, Thread Limit H3, Class of Fit 6H, Number of Flutes 3