Powder coated aluminum “Hitch Mount.” The end that fits into the receiver is 15″ long and is a 2″x2″ square (outside measurement). The hole for the pin is 5/8″ in diameter. This is used primarily for RV camping or even tailgating in a parking lot! A hitch pin is not provided. It comes with a sleeve to fit a 3″ diameter flagpole. Don’t forget the Reducer Sleeve for Mounts if your pole is the 15′ or 20′ LT (2.5″ base).