On Stage SSA20M M20 Speaker Mount Adapter<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Replacement adapter for your subwoofer mounting poles </span></li><li><span class="a-list-item"> The M20 threading has a much more solid hold than the original 1.375 inch sockets </span></li><li><span class="a-list-item"> Perfect to use with the On Stage Adjustable Subwoofer shaft </span></li><li><span class="a-list-item"> Includes 4 mounting screw </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31Nn%2B%2BpNQDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41bTpq7cUHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/01J5DYTHMaS.png" noproxy>