Bought with other equipment and not used by me. Not sure of the standard size - they measure at 14cm max dia. With some sort of dovetail plate - it seemed to fit in my EQ5 OK. Both the holes in the rings and in the plate are threaded - probably needs two new un-threaded central axis holes in the plate to use this combination effectively. Bintel sell a new pair of 136cm rings for $59.
OK, $35 for this lot plus postage. (Or pickup from Bundoora during working hours).
Thanks Russ.
