Features These taps have a bright finish that provides a smooth, polished surface. Thread Size / 1/4-20 inch Thread Standard / UNC Tap Chamfer / Taper Tap Material / Carbon Steel Tap Finish / Bright (Uncoated) Thread Length / 1 in Overall Length / 2 1/2 in Thread Direction / Right Hand Number of Flutes / 4 Coolant Fed / Non-Coolant Through Drill Bit Size / #8 Measurement System / Fractional Inch Primary Material Application / All Materials Series / 312-1183 Shank Dia. / 1/4 in Shank Type - Machining / Straight Square Size / 0.1910 in Standards / ASME Tap Grouping / Individual Tap Style / Straight Flute Threads per Inch / 20