Check the listing for details. (8) Boat Trailer U-Bolt Hot Dipped Galvanized Square 1/2"Dia x 3 1/16" x4 5/16". Condition: New. Listed at 39.68 USD. 8pc Boat Trailer U-Bolt Hot Dipped Galvanized Square 1/2"Dia x 3 1/16" x4 5/16"Heavy Duty 1/2 inch diameter U-Bolt Specifications: - 1/2 “ diameter - 3 1/16 “ wide between the legs - 4 5/16 “ Long from the inside down - 1/2 - 13 “ thread size - Hot Dipped-Galvanized to prevent corrosionEach Ubolt includes:(8) 1/2 “ x 3 1/16 “x 4 5/16 “ Squared U-Bolt(16) Galvanized Nuts(16) Galvanized lock washers(16) Galvanized flat washers NOTE:These Hot Dipped 1/2 inch diameter U Bolts feature added strength over the 3/8 inch. The process of hot dipped galvanizing gives these U Bolts the needed corrosion protection to make them ideal to use in any situation, and especially on boat trailers. To select the correct U Bolt for your application, you must consider the material dimensions that these U Bolts must fit around, and the thickness of the item that you are mounting. Some very common applications for these 1/2 inch U bolts are Boat Trailer Bunk Brackets, Leaf Springs, Winch Posts, Trailer tongues, Leaf spring brackets, and trailer cross members.