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Hi John,
I believe it would be for a 10" scope, I can't tell you the exact 'tube' size. If you're making your own scope, you may find you'll need to do some clever spacer work to fit most focusers to a round tube to either increase or decrease the 'radius' of the fitting surface. These can be fitted to a flat focuser board too.
That's what I had to do with the focuser on my big dob. It was 'curved' for a round tube, I just laid it on top of my flat focuser board, and the little segments of space are inconsequential.
Alex.
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