U-bolt conveniently mounts brackets and accessories to trailer frames. Zinc-plated construction is durable and long-lasting. Square bend. Grade 5. U-bolt comes packaged with nuts and washers. 7/16"-14 diameter/thread. 4"L x 2-1/8"W. Designed with a square bend Comes with nuts & washers | Smith Zinc-Plated U-Bolt, 4"L x 2-1/8"W