RAM Mount X-Grip Large Phone Mount w/Handlebar U-Bolt Base [RAM-B-149Z-A-UN10U]X Grip Large Phone Mount with Handlebar U Bolt Base The RAM B 149Z A UN10U consists of a zinc coated u bolt base, short 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