Hinged, cast-aluminum rings with felt lining. Designed for use with Orion SkyView Pro and Atlas equatorial mounts; and may fit some other mounts as well. One ring in each set has a 1/4″-20 piggyback camera adapter, the other has a threaded 1/4″-20 hole. Sold in sets of two rings. Mounting bolts and washers are included. Inside diameter (i.d.) is 144mm. One-year limited warranty.
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