I purchased a single diamond hole saw from a big box store but I needed an additional size that the store didn't have. I searched on line and found this set for only a little more than I paid for the single saw from the store. When the set arrived I sawed a 2 1/2 inch hole for a bath tub valve and a 3/4 inch hole for the spigot (both in ceramic tile). The jig was easy to use and the saws cut perfect holes.

Used the 70mm and cut 9 holes so far. Used the guide as well. Spray bottle with water sprayed in every 30 seconds or so. Made sure the hole was wet. Ran the drill on medium speed.

The suction cup wouldn’t stick to the tile, even wet. So I clamped it and drilled three 1.5” holes no problem. Even went through the durock.