Whats the best way of cutting out power point sockets in granite tiles 12mm thick?

Question

Granite tiles are 457mm x 457mm x 12mm. I need to cut around two power sockets, but cannot workout how to cut rectangle hole in tiles? any ideas

Answer 1

DIMOND WHEEL 4 1/2 INCH cut the front to size then finish it on the back so the oversized cuts wont show.  measure twice.