I used a 2.5 inch hard surface drill bit from lowes to make the holes it cost about $13
I put the pots in my utility sink and ran water over the pots to keep the bit cool go slow and get some one to help hold the pot.

Blow air straight into the hole with the canned air. This will loosen and remove some of the concrete dust around the drill bit. Lock the jaws of a pair of vise grips around the end of the bit, if the bit broke off above the surface. Grab the bit as close to the work surface as possible.

It’s more of a marketing thing to make them sound better. Technically, 20V is the maximum output at startup. Nominal output (the power supplied when working normally) is actually 18V. So 18V batteries are actually the same, it’s just that some manufacturers use different descriptions.

I had the Hilti SFH 22v combi drill, i sold it and got the Festool DRC 18v. It has about the same power as the Hilti but is a lot smaller and lighter..