Three Piece Tap Kit, Tap Thread Size 1/4 In.-28, High Speed Steel, Bright (Uncoated), Thread Standard UNF, Thread Length 5/8 in, Overall Length 2 1/2 in, 75 Percent Thread Drill Size 5.45 mm, Thread Limit 2B, Class of Fit 3B, Thread Direction Right Hand, Number of Flutes 4