Rail Base with Stainless Steel U-Bolt & 1 in Ball

RAM MOUNTS' RAM-B-231U rail base with stainless steel U-bolt contains a 1 in rubber ball designed to sit at right angles to the mounting rail. The rust proof metal U-bolt accommodates rails in diameter from 0.5 in – 1 in in diameter. Included are black cover caps to be placed over the exposed ends of the U-bolt and a composite adapter that can narrow the rail to a minimum width of 0.5 in.