Attach your Humminbird fishfinder, gimbal bracket, or other marine electronic device to your boat's bow with Arkon's APEQUIP universal marine electronic mounting plate. You can also use APEQUIP to attach other accessories, including batteries, CB radios, Ham radios, and audio receivers. The plate can also be used as a splitter plate. The powder-coated steel plate measures 6.75'' (17mm) long, 2'' (50mm) wide, and 4mm thick. It features 48 4mm unthreaded holes that are spaced apart to provide a number of mounting options, including multiple 4-Hole AMPS devices. The four 5mm holes in the center of the plate are also recessed in the 4-Hole AMPS pattern. The 4-Hole AMPS pattern consists of four holes located in a rectangular pattern spaced at 30.17mm by 38.05mm (measured as the center-to-center distance between holes). Use with any of Arkon's pedestals to mount it to your boat or other surface (pedestals and screws are not included and sold separately).