【Color differentiation】Rethread Repair Tool are color- coded for quick visual identification. 7 x UNF Dies (Black). 7 x UNC Dies (Silver). SAE Thread File 1: 9 - 10 - 12 - 16 - 20 - 27 - 28 - 32. SAE Thread File 2: 11 - 12 - 13 - 14 - 16 - 18 - 20 - 24.
