Whats the best item to use to drill holes for downlights (spotlights)? Can anyone tell me what the best opening to drill holes in...

Can anyone tell me what the best opening to drill holes in ceiling is for spotlights, is there a flat drill bit that one can buy, that is to say big enough and what size would this be? or is here a different tool to use?
Sagging futon frame - ugh! Anyone get a...
Answers:    theres a proper set for downlight holes.you can get them from b@q .cost from almost lb5 upwards.depending on the quilaty of the set
How do i cause my room look larger.i...
you can buy a hole cutter which is a drill bit with a circular cutter round the outside
try B&Q