The 081-0117-203 is a Dialight 373 Series indicator base designed for mounting in an 11/16" clearance hole (.688") with a T-3 1/4 miniature bayonet bulb base. The base features brass solder terminals with hot tinned elongated slots (5/64" × 1/8"), a brass housing with black nickel finish, and includes a mounting nut (brass, white nickel finish) and internal-tooth lockwasher (phosphor bronze, white nickel finish). The assembly is watertight and meets MIL-L-3661C requirements with mechanical dimming lens cap options available in non-diffused, translucent, and diffused configurations. This indicator base is commonly used in ground vehicles, aircraft cockpits, naval vessels, power distribution centers, and surveillance systems where reliable visual indication and environmental protection are essential.