RAM MOUNT X-Grip 5" Base MountConsists of a zinc coated u bolt base, double socket arm and universal spring loaded X Grip IV cradle for large phones and phablets. 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 B size 1" diameter