I have always used thread chasers myself so as to remove as little metal as possible. The chasers are made to chase/clean existing threads where a tap is made to cut new ones. Mac, Snap-On, and Matco all carry the identical set so I have no doubt that someone else makes it and reboxes it for them. The set has all of the metric and sae chasers in it, both fine and coarse as well as inner and outer. The set also includes 2-3 thread files which you rarely have a need for but man they are bitchen when you need them.


Mark