The RAM-101U-B-235 consists of a short double socket arm, one round 2.5" diameter round base with the universal AMPS hole pattern and stainless steel double u-bolt base that will fit pipes from 1" to 1.25" in diameter. Designed into the mount is a 1.5" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles. 

U-Bolt Dimensions:
Accommodates rails from 1" to 1.25" in diameter.

Material:  
Powder Coated Marine Grade Aluminum 

Ball Size:
1.5" Rubber Ball Size 

Note: 
The "U" in the part number reflects product packaged in poly bag.