A good investment, eh?Cheers! It was a steep learning curve but got there quickly, it was very slow on a nice drill with a decent trigger for speed control that did it.
Also use spray 3in1 to lubricate, although we went to slow that you could hold the cobalt bit after all rivets drilled between your finger tips. It was stone cold, just watching the metal swarf come off in strands showed how easy it was. The drill bits I got had a review where someone used them for 28mm steel beams, so knew it was a safe bet for 3 simple rivets.
With the use they'll get they're likely a tool for life too, so a good investment