Add An Insert Plate to Your Shop-Built Router Table 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. Pack of 4 Features Eliminate need for supporting rabbet Unique bottom-mount design Locating tabs for easy installation Four-corner lock-downs for stability Eight adjustable points of contact Features: Precisely adjusts and locks router table insert plates in position Construction: Plastic polymer, steel, brass Compatibility Precision Router Table Top Precision Router Table System Precision Benchtop Router Table Precision Router Lift Precision Router Table Insert Plates Includes (4) Insert Plate Levelers Mounting hardware Owner's Manual