National is a global organization supplying hardware for the architectural, consumer, industrial and residential markets worldwide. National continues to deliver the innovative, high quality products that have made the National name synonymous with the highest craftsmanship and dependability for more than 160 years. Providing a reliable barrier against unauthorized entries. Barrel bolts add additional security and are made in standard, heavy duty or extra heavy duty versions for indoor and outdoor applications. A proprietary WeatherGuard zinc coating is three times more corrosion resistant compared to the competition.