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wrote:
I have fitted a new sink that is lower than the original one so the
inlet to the main waste, down pipe is too high.

The house was built about 20 years ago and I expected all the piping
to be plastic but it is a galvanised metal and rings like iron. I
have a strap boss that I was hoping to fit but first I have to make a
55mm hole. Is there a tool? Can it be done? How?
Alex.

Yes a hole saw. "fred" gave a list of parts from BES for such a job only a
few days ago.
Search in this group on Google for 57mm +hole +saw +code