The RAM-B-231Z-LO4 consists of a 1" rubber ball designed to sit at right angles to the mounting rail. The zinc coated metal u-bolt accommodates rails in diameter from 0.5" to 1.25" 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".
U-Bolt Dimensions: Accommodates rails from 0.5" to 1.25" in diameter. Material: Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size Note: Part number reflects product packaged in clear clam shell for store shelf display. Weight:0.32 lbs.