National Hardware Extra Heavy-Duty Barrel Bolt 8 Inch Zinc NH N151-167National Hardware's 8" Zinc Plated Extra Heavy Barrel Bolt is designed for security on farm buildings, sheds, stockrooms, doors and other heavy duty installations It can be padlocked for additional protection. Steel case, strike, and bolt for durability. Can be mounted with carriage bolts for added security. For interior and exterior applications Bolt diameter is . 6 Coated with Weatherguard Protection to withstand harsh weather conditions and prevent