B-Square Universal Cantilever Mount-Ribs up to 3/8-Inch， Matte Black Finish<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"> Includes rings </span></li><li><span class="a-list-item"> One-piece base </span></li><li><span class="a-list-item"> Fits universal cantilever to 3/8 inch </span></li><li><span class="a-list-item"> Clamp to most shotgun vent rib barrels; rings not included </span></li><li><span class="a-list-item"> No gunsmithing required </span></li><li><span class="a-list-item"> Cantilevers over the receiver </span></li><li><span class="a-list-item"> Works with Weaver style rings </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31GiM2cyCvL.jpg" noproxy>