This universal equipment mounting plate can be used in a variety of ways. Use APEQUIPXL in conjunction with Arkon's pedestals (not included) to attach devices or accessories, including batteries, CB radios, Ham radios, and audio receivers. The plate can also be used as a splitter plate. Or, attach your Humminbird fishfinder, gimbal bracket, or other marine electronic device to your boat's bow. Live streamers can use this mounting plate to attach multiple devices to a tripod or other stand for live broadcasting. The powder-coated steel plate measures 13.75" (352mm) long, 2" (50mm) wide, and 4mm thick. It features 120 4mm unthreaded holes that are spaced apart to provide a number of options, including mounting multiple 4-Hole AMPS devices. The four 5mm holes in the center of the plate are recessed and in a 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 APEQUIPXL with any of Arkon's pedestals to mount the plate to your boat or other surface (pedestals and screws are not included and sold separately).