The RAM motorcycle handlebar base contains a 1.5″ rubber ball designed to sit at right angles to the mounting rail. The “Rust-Proof” stainless steel u-bolt accommodates rails in diameter from 0.5″ to 1″ 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″.