The RAM-B-235U consists of a double u-bolt base with 1" 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"

Material: 
Powder Coated Marine Grade Aluminum 

Ball Size:
1" Rubber Ball "B" 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.