This special fitting has been designed to fit Halcyon bar end mirrors to the new Triumph Bonneville motorcycles manufactured since 2002.
The new Triumph handlebars have a factory fitted insert with an M5 thread. This insert will drop inside the handle bar and the bolt is M5 to suit the existing thread.
- Diameter: 20 mm
- Depth: 13 mm
Please check that the insert has a M5 thread, some Triumph have a M6 thread.