whats the normal hole size for door lock sets?? 54mm? 52mm? or what?

i need to go out and get some new door locks, them privacy ones you have on bedrooms, round ball shaped handles with a little push button on the inside to lock it.
i have a new door i need to fit them to, what size holes do i need for this??
i ahve a hole saw of 52mm and 57mm, but hte instructions online seem to say i need a 54mm hole. what im wondering is does it really matter if its 52mm or wont it fit??
and what size does the knib thing need to be to fit?? i have a 25mm spade bit.


Read and reply to the full thread at RenovateForum.com....