RAM Mount RAM Double U-Bolt Rail Mount f/Larger Rails [RAM-101U-235-1]RAM Double U Bolt Rail Mount for Larger Rails The RAM 101U 235 1 consists of a 6 inch double socket arm, one round 2. 5" diameter round base with the universal AMPS hole pattern and stainless steel double u bolt base that will fit pipes from 1. 25" to 1. 5" in diameter. Designed into the mount is a 1. 5" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. Rubber ball and socket technology allow for