Three-Piece Hand Tap Set, Tap Thread Size 5/16 In. -24, High Speed Steel, Bright (Uncoated), Thread Standard UNF, Thread Length 1 1/8 in, Overall Length 2 23/32 in, 75 Percent Thread Drill Size I, Thread Limit H3, Class of Fit 3B, Thread Direction Right Hand, Number of Flutes 4