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