Product Info Catalog Hardware Builders Hardware Connection & Wire Goods U Bolt, #546, Zinc, 5/16 x 2-1/2 x 5-In. U Bolt, #546, Zinc, 5/16 x 2-1/2 x 5-In. Request a Quote UPC: 38613126169 SKU: 661611 Model Number: N222-562 5/16" x 2-1/2" x 5", #546 zinc u-bolt.