Standard U-Bolt, Standard U-Bolt, 304 Stainless Steel, Finish Plain, Thread Size 7/8 In.-9, Thread Length 4 1/4 in, Inside Length 16 1/16 in, Inside Width 12 7/8 in, Pipe Size (In.) 12 in, Characteristics Has Coarse Rolled Threads, for Steel or Wrought Iron Pipe Sizes, Includes 4 Hex Nuts