The Powder Coated Marine Grade Aluminum LONG double socket arm has a socket at either end to allow a 2.25" diameter ball accessories to be connected. Overall Length: 12.875"Socket-To-Socket Length: 11.1875" Part number reflects product packaged in clear clam shell for store shelf display. For additional specifications, see components and drawings tabs.Black Powder Coat2.25 Inch Rubber BallPowder Coated Marine Grade Aluminum