Use this router table insert mounting base plate to easily invert any router in a router table. Using this plate will allow quick and easy bit changes, height adjustments and router maintenance. The plate is made from sturdy ¼ inch thick anodized aluminum that will not sag and will resist scratches. Overall size is 9 inch x 12 inch x 1/4 inch thick. It has 3 removable insert rings that twist in place using the included wrench to provide 3 different bit openings (2-1/2 inch, 1-3/16 inch and 1 inch ). These openings will accommodate a wide variety of bit sizes. The 1-3/16 inch ring will accept PC style router guide bushings. Plate comes with a steel starting pin for small and curved work. Plate has predrilled mounting holes to secure to your table. Also comes with an innovative leveling system that uses 7 Allen screws for fine adjustments and rare earth magnets to keep the plate secured to your table without screws. The bottom of the plate has multiple starting holes to simplify drilling the holes needed to attach any router. Comes with all needed hardware to secure and level. Overall size is 9 inch x 12 inch x 1/4 inch thick.