ᐅ Size of the drilling / milling in 20mm porcelain stoneware

Hello everyone,

Yesterday, I started installing 20mm (0.8 inches) porcelain tiles on the terrace. Now I still have the drain pipe, which I would preferably like to install using a core drill. A two-piece tile looks unattractive.
Are there suitable hole saws, or can this be done with a router bit? Core drills don’t have a centering tip, so you would need to build a fixture to mount the machine with anchors and clamp the tile securely.

Stephan

This is done using a diamond core drill bit for the angle grinder, freehand.

It worked quite well with a core drill and a suitable drilling template made of wood.