Drilling Tool?

[Dave]

What size hole you drilling? this for a turbo adaptor plate? I would just get the grinder out with a decent cutter and cut it like an astrix, then with a worn stone give it a go (for the not so accurate job). Or chain drill it and stamp it out with a hammer and finish off with a grinder.

Or you could do it the proper way with a pillar drill of decent size but not many people have these.