Pack of 4 - Sq U-Bolt Zinc-Plated Steel, 3/8"-16 Thread, 4" Inside W, 4-5/8" H

Mount Type - Threaded Thread Size - 3/8"-16 Inside Width - 4" Height - 4 5/8" Thread Length - 3" Capacity - 1,075 lbs. Square U-Bolt Zinc-Plated, Steel, 3/8"-16 Thread Size, 4" Inside Width, 4-5/8" High.

eBay