This is a short double socket arm for the RAM "D" sized ball and socket system (2.25"). A single spring inside the arm opens the end sockets that allows you to pivot the ball and socket connection at almost unlimited angles. 

• Dimensions: 
  Overall Length: 5.0625" (12.86cm)
  Socket-To-Socket Length: 3.1875" (8.09cm)
• Material: Powder Coated Marine Grade Aluminium
• Ball Size: 2.25" Rubber Ball "D" Size

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