Orion 7370 90mm ID Telescope Tube Rings<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Set of two cast aluminum telescope tube rings with quick-release， hinged clamp knobs and felt lining </span></li><li><span class="a-list-item"> One tube ring has 1/4"-20 piggyback camera adapter post; the other has threaded 1/4"-20 socket </span></li><li><span class="a-list-item"> Set of two telescope tube rings with mounting bolts and washers included </span></li><li><span class="a-list-item"> Use with Orion EQ-1， EQ-2， EQ-3， or AZ-3 telescope mounts </span></li><li><span class="a-list-item"> Inside ring diameter is 90mm </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31MEP67T14L.jpg" noproxy>