) 2 1/2 in, Characteristics Has Coarse Rolled Threads, For Square Form Connections.-18, Thread Length 1 in, Inside Length 3 11/16 in, Inside Width 3 in, Pipe Size (In.Standard U-Bolt, Standard U-Bolt, Steel, Finish Hot Dipped Galvanized, Thread Size 5/16 In., Includes 2 Hex Nuts, U-bolt, Package Quantity 10.