Billet aluminum construction, except for PART #2030-0139 which is chrome-plated die cast  Accept most 7 1/4" x 4 1/4" license plates  No exposed mounting hardware; bolts from the back side  Radius license plate frame looks best when used with backing plate PART #DS-720848, but will work with othersLighted LED license frame PART #2030-0139 functions as a brake and taillight