Product information "Precision Router Table Insert Plate Levers" Add An Insert Plate to Your Shop-Built Router Tabl These unique levelers are the easiest way to add an insert plate to your shop-built router table. They eliminate the need for a supporting rabbet and feature a unique bottom-mount design that includes eight adjustable points of contact, four-corner lock-downs for stability, and locating tabs for easy installation. Technical Description Fits 3/4" (19mm) corner radius For Use with Router tables up to 11/2"-thick (38mm) Includes (4) Precision Router Table Insert Plate Levelers mounting hardware owner's manual