"Roger Hamlett" wrote in message
...

All the Celestron, and Meade scopes, use imperial threads.
I think you are talking about the holes in the top face of the tripod
itself
(the ones used to attach the wedge), rather than the holes in the scope
base?. If so, these are 5/16 ANC.

Right -- 5/16 coarse, as we call it in America.