The Blue LED Bulkhead/Livewell Light, also known as "The Shortie" is shock and vibration proof, cool to the touch, corrosion resistant. and operates 9-16 Volt DC systems. It is rated at 100,000 hours of service life. The grommet requires a 3/4" hole. This light is rated for underwater use and can also be used as accent lighting on yachts, boats, RV's and trailers.