SOLD!! Never used. These rings are not hinged, but have an adjustment screw at the bottom which allows the OTA to move forward and back in the rings. Accessory mounts on top of each rings (1/4-20 female). These cost me $60.00 and I've never used them. I'll sell for $35.00 shipped FedEx. Money order OK (Personal Check from Astromarters with 5 Stars--no wait). Immediate shipping.