If you’re talking about then plastic base plate of the R2200, it’s 3/8 in thick, very nearly 6" OD and 2.5" ID. If you’re talking about the router base itself, it’s maybe 1/8" radius less than the plastic base for OD and maybe about 3 5/8" for the ID. It’s harder to measure the base itself as there is much mouinted arounbd it 
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