Features: Our round U bolts zinc plated, adding an extra layer of protection against rust and corrosion, This feature ensures your bolts are not only corrosion-resistant but also durable. Remember to use only a manual socket ratchet or wrench for installation to avoid wear and tear of the u bolts. Specifications: Material: black zinc plating Color: black Size: about 1/2 inch/ 1.27cm in diameter, 3 inch/ 7.62cm in width and 8 inch/ 20.32cm in length Package includes: 4 x U bolts 8 x Stainless steel hex nuts 8 x Flat washers Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.