RAM Mounts Handlebar / Rail U-Bolt Mount Kit The Ram-B-149Z consists of a marine grade powder coated aluminum u-bolt base and double socket arm connected to a diamond adapter mounting flange. The Ram-B-149Z-202 consists of a marine grade powder coated aluminum u-bolt base and double socket arm connected to a flat 2.5 diameter adapter mounting flange. The diamond and round hole adapter bases have hole patterns that match the industry standard Amps pattern and will connect to a large variety of RAM Mount and third party cradles. Designed into the mount is a 1 diameter patented rubber ball and socket system with adjustment points at both ends of the double socket arm. With a twist of the arm knob, you can move the mount to your optimum viewing position. Included in this package is hardware that will accommodate rails from 0.50 to 1.25 in diameter. Features: The U-bolt base makes attaching to handlebars, tubing, or railing a breeze Simple to install and easy to use, the possibilities become endless Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles High quality materials insure your device is safe, secure, and within easy reach Ram Mount's patented design also dampens shock and vibration helping to extend the life of your mobile device Included in this package is hardware that accommodates rails from 1/2 to 1 1/4 in diameter