Product Info Catalog Hardware Builders Hardware Connection & Wire Goods U Bolt, #546, Zinc, 3/8 x 3-1/2 x 5-1/4-In. U Bolt, #546, Zinc, 3/8 x 3-1/2 x 5-1/4-In. Request a Quote UPC: 38613126282 SKU: 661629 Model Number: N222-224 3/8" x 3-1/2" x 5-1/4",#546 zinc u-bolt.