Superior Compatibility - The mounting plate features 20 pre-drilled holes to match a variety of electronic devices and mounts such as marine fishfinders and GPS chartplotters, gimbal brackets, CB radios, Ham radios and more. Perfectly fits 1 inch / B size / 25 mm arm systems, compatible with Ram Mounts, Scotty and more. RAM Mounts, Arkon, iBolt and others (complimentary 4 sets of 316 marine grade stainless steel machine screws and lock nuts). Designed for Marine Environment - Constructed from Marine-Grade Powder-Coated Aluminum and tested for thousands of hours in salt spray to ensure reliability and stability in the harshest environments. 1" Ball Made of Marine-Specific, High-Strength Composite Material, which is more resistant to high salt water corrosion and less prone to deformation than rubber, and provides the same friction as rubber. Longer Service Life - The ball and mounting plate are Molded in One Piece, rather than screwed together, for longer service life and to ensure the stability of the device. Cast in one piece of aluminum for strength and durability under the impact of waves. Compatible with Garmin GPSMAP 162, GPSMAP 168, GPSMAP 175, GPSMAP 180, GPSMAP 180C, GPSMAP 182, GPSMAP 185, GPSMAP 188, GPSMAP 232, GPSMAP 238, Striker 5 Series, Striker Plus 5cv. Recommended for fishfinders up to 5 inches, 1.5-inch ballrecommended for more than 5 inches. The aluminum mounting plate features 20 pre-drilled holes to match a variety of electronic devices and mounts such as marine fishfinders and GPS chartplotters, gimbal brackets, CB radios, Ham radios and more. Perfectly fits 1 inch / B size / 25 mm arm systems, compatible with Ram Mounts, Scotty and more. RAM Mounts, Arkon, iBolt and others (complimentary 4 sets of 316 marine grade stainless steel machine screws and lock nuts). The ball and mounting plate are Molded in One Piece, rather than screwed together, for longer service life and to ensure the stability of the device. Cast in one piece of aluminum for strength and durability under the impact of waves.