Cyclus Tools facing tool for bottom brackets. Max. Milling width: 9mm, max. housing diameter: 44mm. Depending on the respective thread (BSA / ITA / FRA), the corresponding guide bushing is mounted. To avoid overloading, a uniform pressure must be exerted on the cutter with the aid of the guide, the spring and the threaded sleeve. Always use a cutting fluid suitable for the material to be processed.