KREG Precision Router Table Insert Plate Levers (4)These levelers are the easiest way to add an insert plate to a shop built router table. They eliminate the need for a supporting rabbet and feature a unique bottom mount design that includes eight adjustable contact points, four corner lockdowns 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