Allows customisation of the size of the opening around the bit. Includes rings with 3/4", 1-3/8", 1-5/8", and 2-1/8" openings, plus one blank ring that can be used to create custom-sized or zero-clearance ring. Includes moulded storage tray with slots for all 5 Level-Loc Reducing Rings, plus slots to hold the 3 rings supplied with the Precision Router Table Insert Plate or Precision Router Table Lift. Each slot is marked with the opening size, making it easy to keep the rings organised. Fits the Kreg Precision Router Table Insert Plate PRS3034, PRS3036, PRS3038.