Heavy-Duty Low Profile Die Cast Housing with Integral Heat Sinking, Driver Compartment, Mounting Arm Adaptor. Powdercoat Finish Over a Chromate Conversion Coating. Includes Twist Lock Photocell Receptacle. Tempered Clear Flat Glass Lens or Tempered Tempered Clear Flat Prismatic Glass Lens. Mounts on 2 3/8" Diameter Mounting Arm, Adjustable Slipfitter, or Two-Piece Swivel Bracket.