Router guides supply a template or set a path that routers follow to produce cuts of a specific shape or placement. They are used for applications such as creating curved slots and insets, routing cutouts for door hinges, or forming grooves parallel to workpiece edges.

These collets replace missing or damaged collets, which no longer hold bits securely in the router. Their shank connects to the motor spindle, and their head grips the bit to prevent it from wobbling or loosening during routing. They hold bits with a shank diameter that matches the collet size.