The RAM-D-235U consists of a double u-bolt base with 2.25" diameter ball and two stainless steel u-bolts. The double u-bolt base will accommodate rails from 0.75" to 1.25" in diameter.
U-Bolt Dimensions: 0.75" to 1.25" in Diameter
Material: Powder Coated Marine Grade Aluminum
Ball Size: 2.25" Rubber Ball Size
Note: The "U" in the part number reflects product packaged in poly bag. This mount includes stainless steel u-bolts for preventing rust of the mount and black cover caps to be placed over the exposed ends of the u-bolt.