Big Horn 18101 9-Inch x 12-Inch Router Table Insert Plate with Guide Pin & Snap Rings Hole Opening Sizes: 3-7/8" - for large raised panel cutters (plate opening with no rings inserted) 2-5/8" - great for medium size cutters (yellow ring) 1-1/4" - with offset for brass guide bushings or smaller cutters (red ring) INCLUDES: 1 Plate | 2 Snap Out Rings | 1 Shoulder Pin | 3 Cam Action Adjusters | 1 Allen Wrench | 3 Screws with Star Washers | 4 Magnets