Which tools to vent a TUMBLE DRYER please

Either a hammer and chisel, or if you want a neat hole you will need a core drill. They are expensive and for that size you must use a drill with a clutch, otherwise if the drill jams, you could end up with a broken wrist. If this a one off, your best bet is to hire the drill and cutter from a toolhire shop.

BB

 

Drill a series of holes all around 1st, gradually going up in drill size..........then hammer/chisel

 

I agree with ghost-1, pencil round the flexy pipe to go the wall. Drill through the center of circle straight the wall to the outside. Using a shorter drill bit, drill around the pencil line and knock out the inside wall. Now go outside and do the same. You now have a hole that goes all the way through both walls. Any damage to the outer skin wall will be covered up by the vent cover.
BR