This new design combines the durability and impact resistance of EPDM rubber with the convenience and of a retainer/snap-on-cover installation. The 3 3/8” wing style comes with black urethane end caps for a finished appearance. The galvanized steel retainer makes CG-4 perfect for inside or outside. Wing size: 3 3/8" Material: EPDM Rubber with Galvanized Steel Retainer Recommended Mounting: Mechanical Fasteners Color: Black Interior or Exterior Use