Product Info Catalog Hardware Builders Hardware Connection & Wire Goods U Bolt, #526, Zinc, 5/16 x 1-3/4 x 4-1/4-In. U Bolt, #526, Zinc, 5/16 x 1-3/4 x 4-1/4-In. Request a Quote UPC: 38613125988 SKU: 661579 Model Number: N222-158 5/16" x 1-3/4" x 4-1/4", #526 zinc u-bolt.