Perko 1045P00DP Marine Plug-In Round Base for Light Pole<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"> Locking collar is included with base to alloy </span></li><li><span class="a-list-item"> 2-1/4 inch O.D. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31GqWCiBF2L.jpg" noproxy>