5/16" x 2.5" x 3.5", Zinc, U-Bolts, With Plate/Hex Nuts, Designed For Hanging Or Fastening Products To Pipe, Wood, Etc,Bolts Are Suitable For Automotive, Plumbing & Other Home & Industrial Applications, Do Not Use For Overhead Lifting, Support Of Human Weight, Athletic Or Playground Equipment, When Safety Is Involved, Consult Manufacturer, Inspect Frequently, Boxed Loose.