Buyers Products 4 Inch Round Turn Signal Light Kit with 10 LEDs is used on trucks and trailers to meet FMVSS/CMVSS 108 regulations. The light has an amber colored lens and uses a PL-3 connection. The kit includes a PL-3 plug and black grommet for installation. Lights are sold in bulk or in individual kits that include a grommet and plug. They are backed with a limited lifetime warranty.