Three-Piece Hand Tap Set, Tap Thread Size 5/16 In. -18, High Speed Steel, Bright (Uncoated), Thread Standard UNC, Thread Length 1 1/8 in, Overall Length 2 23/32 in, 75 Percent Thread Drill Size F, Thread Limit H3, Class of Fit 3B, Thread Direction Right Hand, Number of Flutes 4. This item has been restricted from sale in the following state (s): []