Standard U-Bolt Standard U-Bolt Steel Finish Zinc Plated Thread Size 1/4 In.-20 Thread Length 2 1/2 in Inside Length 2 15/16 in Inside Width 7/8 in Pipe Size (In.) 1/2 in Characteristics ASME B18.2.2- ASTM A563 Grade A Includes (4) Nuts Package Quantity 5