These unique cam action adjusters insure a perfect snug fit for your router plate into your router table opening. The cams adjust by turning them clockwise until they are firmly up against the side wall of the router table opening. Once in place and secure the adjusters will keep the plate firmly in place and not allow for any side to side movement. The Router Plate adjusters come in a pack of three with all the necessary hardware. Some drilling may be required on your existing router plate for installation. Includes three cam action side adjusters.