This Instrument Hole Adapter is designed to install standard 1-1/8" gauges and meters into 2" instrument dash panel holes. The socket adapter installs by placing the face plate in front of the dashboard then inserting the socket/meter in the hole with the washer behind. Designed with D-flats to prevent gauges from spinning, the assembly is held in place by the socket/meter nut for a clean finished look. Constructed of UV resistant injection molded nylon.