This aluminum arm is used to support an existing gooseneck arm that's already mounted to a shade. Please Note: This support arm is only compatible with our 3/4" gooseneck arms: G2, G4, G6, G7, G8, G9, G10, G13, G14, G15, G17, G19, G22, G24, G25, G32, G34, G36, G40, G64 and G65.