DJS1180 Features: * Handlebar / rail mount * Material: High strength composite and powder coated marine grade aluminum * Consists of a zinc coated u-bolt base, double socket arm and non-locking cradle for the apple iPad and iPad 2 * Twist of the arm knob, you can move the iPad rail mount to your optimum viewing position * Great solution for mounting your iPad on a headrest * Designed to hold the following devices: Apple iPad (1st generation) and apple iPad 2 (2nd generation) * Ball size: 1"" Rubber ball "B" size Includes: * Included in this package is hardware that will accommodate rails from 0.50"" to 1.25"" in diameter Dimensions: * Designed into the mount is a 1"" diameter patented rubber ball and socket system with adjustment points at the base and cradle