Brick wall hole saw.
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Previously:
https://www.homemadetools.net/forum/...826#post198365
https://www.homemadetools.net/forum/...484#post151173
https://www.homemadetools.net/forum/...728#post155816
https://www.homemadetools.net/forum/...842#post190714
https://www.homemadetools.net/forum/...819#post232407
