Standard U-Bolt, Standard U-Bolt, Steel, Finish Black Oxide, Thread Size 3/8 In.-16, Thread Length 1 1/8 in, Inside Length 2 3/4 in, Inside Width 1 3/4 in, Pipe Size (In.) 1 1/4 in, Characteristics Has Coarse Rolled Threads, for Steel or Wrought Iron Pipe Sizes, Includes 2 Nuts