Jeff, welcome to the OLF.
I was considering at one point getting the bridge hole reamer from Grizzly but I was told that it only has 2 cutting flutes. The Stew Mac reamer has 3 or 4 cuting flutes which makes the tapered hole more concentric (which is how it should be).
I spent the money on the Stew Mac reamer because it's considerably better than the Grizzly tool. I've only heard that the Grizzly tool is difficult to get good results with.
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