[Untamed]

Whatever waste they remove from the final cut, you should ask for. If they do a quality job, the sink hole they cut will be a perfect rectangle with rounded corners that you can reuse. If they hack it to death, they're lazy.

When they cut my counter top, they plunge cut the straight sides of the sink hole then used some kind of hole saw to turn the corners. They supported the piece from below with a jack (the cut wasn't done at my house). The rest was a nice "waste" piece that was reused. Ask about that.

Edit: Come to think of it, this is all wet cutting so not sure how they turned the corners. We were told they used some kind of hole saw thing that also did wet cuts. Dunno.