Features: ---Two zinc-coated u-bolts for extra hold ---Fits rails from 1.25" to 1.5" in diameter ---Molded into the base is a 1.5" rubber ball ---Fits most RAM socket arms that accept a 1.5" ball ---Includes black cover caps to be placed over the exposed ends of the u-bolt ---Constructed of powder coated marine grade aluminum ---Holds up to 4 lbs. ---Genuine RAM Mount: Part # RAM-235-1U ---Manufacturer's Lifetime Warranty ---Made in the USA.