Facom Ratchet Maintenance Kit - 1/2" Drive (S.161B-KIT) - master parts kit available for the new Facom S.161B and USAG 237A 1/2 ratchets.. Everything you need to completely rebuild this new series of round head (high performance) ratchet. This kit can be used on the older ratchets but it does not come with the chrome trim ring.