Standard U-Bolt with Mounting Plate U-Bolt with Mounting Plates 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 1 Plate and 2 Nuts