Made from formed steel with elongated cooling slots which allow for fast dissipation of heat. Slips over the barrel and is secured with supplied hardware. Black oxide finish matches most shotgun components. Fits: Most 12, 16 and 20 Ga and .410 pump shotgun barrels. Heatshields should not be used on Mossberg Mariner or Remington Marine Coat Shotguns. This will only fit if the barrel lug is more than 13.5a ^2 from the receiver.