KREG Level-Loc Reducing Rings 5-stk SetThis 5 Piece Set of Level Loc Reducing Rings fits the Kreg Precision Router Table Insert Plate, allowing you to customize the size of the opening around the bit. The set includes rings with 19mm, 35mm, 41mm and 54mm openings, plus one "blank" ring that you can use to create your own custom sized or zero clearance ring. The set comes with a molded storage tray that has slots to hold all five Level Loc Reducing Rings, plus slots to hold the three rings