Tie Down Engineering 86216 Zinc-Plated Round U-Bolt - 3/8"-16 Diameter x 1-3/4" Width x 4-13/16" Depth Shape: Round Rod Width - Threads per Inch: 3/8"-16 Between the Leg Length (inside thread): 1-3/4" Leg Length: 4-13/16" Thread Length: 1-3/4"