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, Thread Limit H3, Class of Fit 3B, Thread Direction Right Hand, Number of Flutes 4 The bright finish on these taps provides a smooth, polished surface. High-speed steel taps provide good wear resistance in general purpose tapping applications in a range of materials, including ferrous and non-ferrous metals.