I need to drill few holes in ca. 5mm steel plate and I neither have a proper size drill bit nor I think my old drill will be powerful enough. Any idea where in Zurich area I could bring that plate and they would drill it for me? I've checked Jumbo and Bauhaus, and those do not seem having such a service... Thanks!!!

Try tuefelwerk or Netzwerk Zürich.

For metalwork in Zurich, try here:
https://www.dynamo.ch/werkstatt/werk...2%80%93-metall

ohh.. that! I thought you found oil somewhere!

Anyway, you can also try

https://www.sharely.ch/en