FCS X-2 Drill bit size

what size does the holesaw bit have to be for FCS X-2 plugs?

1 1/4" hose saw bit, why dont you just buy the installation kit to make your life easier?

because i allready have a bunch of bits i just needed the right size. isnt that 2 3/4 inch though. the plug is only an inch in diamiter though.