I see granite blocks in ancient Egyptian temples with perfect holes drilled into them. The historians say at that time (2500BC) they did not possess iron tools or the wheel and certainly no electricity. The most capable metal tool was made of copper.
One theory suggests that a two-man saw with a flat copper blade was used to make horizontal cuts in granite by throwing sand at the cut line; the silicon quartz pushed by the blade make cutting granite possible. But this process yields something like a 1/2 inch deep cut after many hours of sawing (impractical).
I assume they may have employed a copper hole-saw or tube-like tool using the above method. But it still seems very tedious and impractical.