National Hardware N222-364 2192 Square U Bolts in Zinc, #535-5/16"x2"x5" Manufactured from steel wire Designed for securing various products to rectangular wood and metal objects If plates are required use National's #2191 plates LifeSpan Limited Lifetime Warranty Nuts included Manufactured from steel wire Designed for securing various products to rectangular wood and metal objects If plates are required use National's #2191 plates