Some tiles can be drilled directly in less than 10 seconds. On the contrary, some other tiles require drilling for 10 hours even if you pour water, etc. Therefore, they are suitable for any tile that can be easily drilled, especially for tiles where you want to drill near the corners where applying force will break the corner 9 out of 10 times. For those tiles that are resistant and cannot be drilled easily, a little force with a regular diamond drill bit is needed without pushing it too hard. And you can finish the hole without applying force to avoid the risk of breaking the tile. Certainly, there are other better methods, but these are usually convenient. The best is diamond glass drill bit...