Stainless clamp-on ball mount for horizontal rail. Includes a poly platform for mounting GPS brackets and other accessories. Ideal for mounting hand-held instruments on the pedestal guard, within easy reach of the helmsman and crew. Available in 3" and 5" versions, pre-drilled and tapped to accept Garmin’s Marine Mount for handhelds and small chartplotters. Fits 1”, 1 1/8” and 1 ?” tubing.