Buyers Products 4 Inch Round Stop/Turn/Tail Light with 18 LEDs is used on trucks and trailers to meet FMVSS/CMVSS 108 regulations. The light has a red lens and uses a PL-3 connection. Black grommets are also available for mounting. Lights are available in bulk (sold in multiples of 10) or individually in a kit that includes a grommet and plug for installation. They are backed with a limited lifetime warranty.