The RAM-MC-231CH consists of a 1" 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" to 1" in diameter. The base also includes black cover caps to be placed over the exposed ends of the u-bolt. U-Bolt Dimensions: Accommodates rails from 0.5" to 1" in diameter.
Material: Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size Weight: 0.19 lbs.