The Kramp-RAMB231 is a genuine RAM Mounts B-size rail base, also known by its OEM part number RAM-B-231U. This robust mounting bracket is engineered for secure attachment to rails or bars with diameters ranging from 12.7 mm (1/2 inch) to 25.4 mm (1 inch). It is constructed from durable marine-grade aluminum and includes a 25.4 mm (1 inch) rubber ball, providing a stable and versatile platform for various RAM Mounts components. Ideal for a wide range of agricultural, construction, and industrial applications requiring reliable equipment mounting.