Abstract: Universal clamps, devices, apparatus and methods having slidable clamp portions over U shaped legs on a holder, for clamping drink holders, rod holders, utility holders, a caddy or a shelf, on any vertical, angled, and horizontal pipes, tubes, shafts, and the like. The clamp portions and holders can be formed from marine grade UV(ultraviolet) resistant polymer material. Fasteners, such as screws with threaded posts lock the clamp portions into the legs of the holder wherein the threaded posts remain protected and fully covered within the legs and the clamp member when the clamp member is locked to the holder. The holders can include a single loop, two side by side loops or a loop pivotally attachable to a base member that supports the U shaped legs.