The RAM motorcycle handlebar base contains a 1" rubber ball (B) size Designed to sit at right angles to the mounting rail The rust proof metal U-bolt accommodates rails from 0.5" to 1" in diameter The zinc coated metal u-bolt Black cover caps to be placed over the exposed ends of the u-bolt included Composite adapter included that can narrow the rail to a minimum width of 0.5" Made of powder coated marine grade aluminum Display packaged