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 Garmins Marine Mount for handhelds and small chartplotters. Fits 1x9D, 1 1/8x9D and 1 ¼x9D tubing.(GPS and bracket not included).