It is made of Strong Smooth Polished Brass that helps to resist corrosion for long-life service. It is very durable and long-lasting, high-quality brass, no drilling required, and easy Installation, just add Simply Connection. Use on Marine Boat Underwater and Pool Lights. Easy to Use: These plugs provide boaters with a lasting seal on the water and a very nice look with the LED light, suitable for pool lights, marines, yachts, ships, and so on. Dimensions: BSPT: 14-1/2 inches; Bulb: 1W, 12 V; Lumens: Blue-15LM. Colors available: Blue, White, Green, and Red. Package Includes 1 piece of Marine City Underwater Brass Drain Plug Blue LED Light.