Woodpeckers TLRSET-ML - 8 Piece Twist Lock Ring Set
It's recommended that the opening in the router plate be approximately 1/8" to 1/4" larger than the bit diameter. This clearance is enough to allow for air flow as well as stock support while routing. This set includes one each; solid (no opening), 3/4, 7/8, 1-3/8, 1-5/8, 1-7/8, 2-1/8 and 2-3/8 opening and is meant to be used in addition to the 3 rings that come with your Woodpeckers router lift or plate.
The rings come in a handy storage tray with 2 additional slots to hold the unused rings you already have. Molded from a polycarbonate reinforced ABS, these rings won't damage your router bits if they accidentally come in contact and they won't dent or bend if dropped.