The park tool fts 1 fork threading set is designed for cutting new threads and for chasing existing threads on fork columns that are not chromed the fts 139s expandable cutting dies are made from the highest quality high speed steel for precision cutting and long life the unique thread guide system used with the fts 1 is specially designed to allow the metal chips and shavings that result during use to fall completely through the guide preventing damage to the fork threads and the tool n