This is a simple but clever recessed cover for your boat's battery selector switch. It's made in the USA from tough Acrylic Capped ABS plastic that can handle the sun and weather. You install it flush into your cockpit panel or console, and it has a little white door that closes to protect the switch from spray, rain, and accidental bumps. It's designed to fit common round battery switches from Perko, Marinco, and Blue Seas (E & HD Series). The switch itself is NOT included—this is just the protective cover. The cutout hole you need to make is 5.75 inches in diameter. The whole cover is about 7.5 inches across and 1.25 inches deep. It gives your boat a clean, professional look and keeps critical equipment safe. Easy to install if you're handy with a hole saw.