This mount is made up of a small Tough-Claw™ base, a double socket arm and round base adapter, all in the "C" sized (1.5" ball size).

The RAM Tough-Claw™ is the perfect mounting base for quick and easy tool-less installation and removal on round, square, odd shaped rails and bars, and can be clamped on rails from 0.625" - 1.5" outer diameter. The round base adapter contains the industry standard universal AMPS hole pattern, which will connect to a large variety of RAM Mount and third party cradles. The mount is designed with a RAM 1.5" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. 

• Clamping Range (Rail/Tube Surfaces): 0.625" to 1.5" (15.88mm to 38.1mm)
• Clamping Range (Flat Surfaces): 0" to 1.14" (0mm to 28.96mm)
• High strength glass filled nylon construction with corrosion resistant stainless steel hardware
• Rubber pads provide stable, even gripping and protection of mounting surface
• Clamp jaw is configured for round, flat and odd shapes
• Quick installation and removal of Tough-Claw™
• Lifetime Warranty!
• Material: High Strength Composite 
• Ball Size: C Size 1.5" Rubber Ball 

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