The router guide bushing is intended for guiding the router along the template or a dovetail jig.
If, for example, your router blade does not have a bearing that would slide against the template, you can use it instead. This will ensure that your routing is limited to a certain depth into the workpiece.

Outer diameter of the ring: 11.1mm.

Diameter: 60mm

Distance between screws: 50mm.

Router guide bushing is suitable for the Silverline dovetail jig.