Product Info Catalog Hardware Builders Hardware Connection & Wire Goods U Bolt, #532, Zinc, 5/16 x 2 x 3-1/4-In. U Bolt, #532, Zinc, 5/16 x 2 x 3-1/4-In. Request a Quote UPC: 38613126039 SKU: 661587 Model Number: N222-166 5/16" x 2" x 3-1/4", #532 zinc u-bolt.