Attributes . 1 in - 8 NC, 1/2 in - 13 NC, 10pc Set Includes Hexagon Re-threading Dies in the following sizes: 1/4 in - 20 NC, 3/4 in - 10 NC, 3/8 in - 16 NC, 5/16 in - 18 NC, 5/8 in - 11 NC, 7/16 in - 14 NC, 7/8 in - 9 NC, 9/16 in - 12 NC . Names