U-Bolt, Standard, 304 Stainless Steel, Finish Plain, Thread Size 1/2 In.-13, Thread Length 1 1/2 in, Inside Length 6 in, Inside Width 4 1/2 in, Pipe Size (In.) 4 in, Characteristics Has Coarse Rolled Threads, for Steel or Wrought Iron Pipe Sizes, Includes 2 Nuts