RAM Mounts Strap Mount For Bars/Rollbars From 1.5" to 3.15" RAM-B-231-2U Can be mounted with either the utility strap, or included zinc u-bolt Utility strap will attach to bars or railings between 1.57" and 3.15" in diameter; u-bolts will accommodate diameters between 0.5" and 1.25" Compatible with other RAM 1" B-Ball components LIFETIME WARRANTY MADE IN THE USA