RAM Handlebar Rail Mount with Zinc Coated U-Bolt Base for the Apple iPhone 4 & iPhone 4S WITHOUT CASE, SKIN OR SLEEVEDescription:The RAM-B-149Z-AP9U consists of a zinc coated u-bolt base, double socket arm and high strength composite cradle. Included in this package is hardware that will accommodate rails from 0.50" to 1.25" in diameter. The base includes black cover caps to be placed over the exposed ends of the u-bolt. The included composite rail adapter can narrow the rail to a minimum width of 0.5". The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. This mount is designed to hold the following devices:Apple iPhone 4 WITHOUT CASE, SKIN OR SLEEVEApple iPhone 4S WITHOUT CASE, SKIN OR SLEEVEU-Bolt Dimensions:0.50" to 1.25"