This is a shorter version of our standard U-bolt made for 3" diameter axles, they are still .625" (5/8) Rolled Threads for extra strength and the threading is 5" to cover any spring under and is what we sell in our spring under kit! Cut off what you dont need after they are on, and they are also Grade 8. If they fit use them (if they dont fit drill your plates until they do)! All of our U-bolt plates are recommended to use 5/8" U bolts. Comes with Tall Nuts and Thick cut 1/4" Washers. U-Bolts are Sold individually.