The provided hole saws are usually garbage. Once you cut a single hole they are trashed. It doesn't look that bad to me though and I'm sure it would work fine.
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Some advice for the next time you drill it is make a template out of at least 1/4” plywood it can be thicker as well and that will stop your bit from walking. And use some c clamps to hold the template on tank.
It does not leak. The template is total trash if you use a rimmed tank. If I could go back, I would have made my own with plywood.How'd the water test go? I also had a rough time with their template (for the L version overflow), but was able to save things by using the dremel on the interior side box to make it fit for my "too high" holes.. The trim hides my screw up quite well lol