The perfect mounting base for quick and easy installation and removal on round, square, and odd-shaped rails and bars ? without tools. Ideal for mounting tablets, action cameras, phones, rod holders, and much more in a wide variety of applications. Made of high-strength glass-filled nylon construction and corrosion resistant stainless hardware. Description Clamping Range 0.625″ to 1.5″ Ball 1″ Size 4.81″ H ? 1.18″ W