I bought this hole saw to make 4 1/8 holes in 3/4 inch plywood, I cut 2 holes and on the 3rd hole the teeth started falling off and is now unusable. I think I only have one kind of bad saw so take this review for what it's worth. Very disappointed, I've never had that with a hole saw. I would return the saw but it took about two months after purchase before I needed to use it.
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