So these FILN indicator lights are super handy little components for any DIY electrical projects. The 12mm size (that's half-inch for us imperial folks) fits perfectly in most control panels and dashboards. They're IP67 waterproof rated, which means they can handle some serious moisture - great for marine applications or under-hood car use. The LED provides a soft but clear glow that's bright enough to see but won't distract you while driving. They come with 20cm wire leads giving you plenty to work with when wiring them up. The metal construction feels quality and the O-ring seal keeps water out from the front. Just heads up - where the wires enter the base could use some extra waterproofing with heat shrink if you're using them in really wet conditions. The brass nickel finish looks professional and they're available in different voltages (this set is 12V). For the price of getting two, these are perfect for adding power indicators to your car mods, boat electronics, or any custom control panel you're building. Reliable, affordable, and they just work like you'd expect them to.