These are a fairly small lights (1" x 2.25") that contain extremely bright LEDs. Our  "Dispersion Lens"  emits an even beam across the entire length with no hot spots that can be found with some LED signals. Made from 6061-T6 Billet aluminum and CNC precision machined. Can even be used as bungee hooks. (Use coated bungees to prevent scratching) Threaded shank is 7/16" diameter. Available in Chrome or Black and with Amber or Red signals. May require a Load Equalizer to maintain stock flash rate.