Attwood 7X7 Aluminum 3/4-Pin Base<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"> 7x7 inches， Non-threaded， acetal bushing， clear coat </span></li><li><span class="a-list-item"> 3.5 inches required diameter mounting hole </span></li><li><span class="a-list-item"> 2.5 inches depth below deck </span></li><li><span class="a-list-item"> Seat mounts， posts and bases available in steel， aluminum， or stainless steel </span></li><li><span class="a-list-item"> 7" by 7" aluminum base </span></li><li><span class="a-list-item"> Non-threaded </span></li><li><span class="a-list-item"> Nylon bushing </span></li></ul><!--   Loading EDP related metadata  --><div aria-live="polite" class="a-row a-expander-container a-expander-inline-container"><div aria-expanded="false" class="a-expander-content a-expander-extend-content" style="display: none;"><ul class="a-unordered-list a-vertical a-spacing-none"><li><span class="a-list-item">Cleat Coat</span></li><li><span class="a-list-item">3.5" diameter Mounting hole</span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51fdm0b4CdL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41-MiMcqMmL.jpg" noproxy></div></div>