Standard U-Bolt Standard U-Bolt 304 Stainless Steel Finish Plain Thread Size 1/2 In.-13 Thread Length 3 in Inside Length 5 7/32 in Inside Width 2 15/16 in Pipe Size (In.) 2 1/2 in Characteristics Has Coarse Rolled Threads for Steel or Wrought Iron Pipe Sizes Includes 4 Hex Nuts