-- Measures 200*300mm; 10mm thick Aluminum alloy insert plate  -- Comes w/ predrilled holes and mounting hardware  -- Alignment marks make it easy to center and mount on almost any router    Product Description  Solid, Flat, and Perfectly Level Mounting Surface  This rugged 10mm thick phenolic insert plate is designed to provide a solid, flat, and perfectly level mounting surface for your router. Measuring 200mm x 300mm, it will accept almost any router (even large, heavy models) with ease.  No Unecessary Mounting Holes  Mounting your router to this plate is easy, but it isn't cluttered up with a bunch of extra predrilled mounting holes that you won't need. Instead.  Level-Loc Reducing Rings  The plate is equipped with our Level-Loc Reducing Rings that allow you to easily change the size of the opening around the router bit. These rings simply twist into place using an included ring wrench to lock in level and flush with the plate surface. The plate comes with three Level-Loc Rings: 1" (25mm), 1-3/16" (30mm) for use with universal-style guide bushings, and 2-5/8" (67mm).  Undrilled and Predrilled Plates