Orion 7373 140mm 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"> Inside tube ring diameter is 140mm， use with telescope optical tubes up to 140mm in outer diameter </span></li><li><span class="a-list-item"> Sold in sets of two rings </span></li><li><span class="a-list-item"> Mounting bolts and washers are included </span></li><li><span class="a-list-item"> One ring has 1/4"-20 piggyback camera adapter; the other has threaded 1/4"-20 hole </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41XTvxFlzxL.jpg" noproxy>