Ram Mount 2.5-Inch Diameter Base with 1 1/2-Inch Ball， Black<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>RAM 2.5" Composite Round Base.</li><li>AMPs Hole Pattern &amp; 1.5" Ball.</li><li>Comes in 1 inch ball， 1.5 inch ball.</li><li>Also comes in aluminum base</li><li>The "U" in the part number reflects the product is packaged in a poly bag.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31DgLbw38VL.jpg" noproxy>