Straight Flute Tap, Thread Size #8-32, UNC, Plug, Overall Length 2 1/8 in, High Speed Steel, Bright (Uncoated), Right Hand, Thread Length 3/8 in, 75 Percent Thread Drill Size 3.40 mm, Thread Limit H3, Class of Fit 2B The bright finish on these taps provides a smooth, polished surface.