National Hardware's 5/16" x 5" Hook and J Bolt, with two hex nuts, are used for hanging items for various applications. Manufactured from steel wire for durability. Standard machine screw threads allows for easily installation in a wide variety of applications. For interior and exterior applications where hanging is desired Coated with WeatherGuard Protection to withstand harsh weather conditions and prevent corrosion The two included nuts affix to each side of the post and allow for adjustment. National Hardware's Lifespan Limited Lifetime Warrant