Three-Piece Hand Tap Set, Tap Thread Size M20x2.5, High Speed Steel, Bright (Uncoated), Thread Standard Metric Coarse, Thread Length 50.80 mm, Overall Length 13.51 mm, 75 Percent Thread Drill Size 17.50 mm, Thread Limit D7, Class of Fit 6H, Thread Direction Right Hand, Number of Flutes 4