Reflector, Mounting Style Screws, Bolts, or Rivets, Round, Red, Overall Width 4 11/16 in, Overall Length 4 11/16 in, Overall Diameter 4 11/16 in, Federal Motor Vehicle Safety Standards Met SAE A, Housing Material Aluminum, Indoor or Outdoor Use Outdoor, Mounting Hardware Included Yes, Mounting Hole Diameter 3 15/16 in, Number of Mounting Holes 2, Permanence Removable, Reflector Material Acrylic, Standards FMVSS, SAE A