I have two hole saws used on glass for sale. I have recently just drilled my tank to fit the xaqua inout system and these bits are the correct size for it.
one is approximately 45mm with the other being 33mm.
They have only been used once to drill 10mm glass.
ideally would like to swop for SPS, LPS or Zoa frags.
If not £10 not including postage.