Housings are machined from 6061 T-6 billet aluminum. Three-wire LED unit on each light includes 10 LEDs and measures 51/4″ L x 1/2″ W; can be wired as run/turn/brake lights. Approximately 3/4″ of clearance is required behind the surface these are installed into. Made in the U.S.A.. May require load equalizer or turn signal controller depending upon application..