4” Gauge Power Socket Adapter Mounting Plate This instrument hole adapter allows you to replace an unused 4 in. gauge with two new 1-1/8 in. style gauges. It is installed by placing the face plate in front of the dashboard and then inserting the socket/meter in the hole with the washer behind. – Features: 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 Specifications: Color: Black Face Plate Outer diameter: 3-3/4 in. Face Plate Inner Diameter: 1-3/16 in. Face Plate Thickness: 3/16 in. Height: 3-3/8 in. Washer Inner Diameter: 1-1/16 in. Washer Thickness: 1/8 in. Weight: 0.06