Ram Mounts Universal Short Arm 3in x 11in Base - The Universal Short Arm Mount has been designed to accept any fish finder regardless of the mounting pattern. The Universal Short Arm mount has been developed with two pivot points that allow you to move and angle your electronics however you need. Capable of supporting up to 15lb. Powder coated marine grade aluminum Ball Size: 2.25in Overall Length: 8.12in Weight Capacity: up to 25lb