Standard U-Bolt Standard U-Bolt Steel Finish Zinc Plated Thread Size 1/2 In.-13 Thread Length 3 in Inside Length 6 1/4 in Inside Width 4 1/16 in Pipe Size (In.) 3 1/2 in Characteristics ASME B18.2.2- ASTM A563 Grade A Includes (4) Nuts Package Quantity 5