4 Pieces Fixing Clamp, U Bolt Fixing, U Bolt, Roof Box Fixing, Durable Frame, Stainless Steel Square High Quality Material: These square head u-bolts are made of 304 stainless steel, rust-proof and corrosion-resistant. The surface of the stainless steel is polished and the surface is smooth and bright, which greatly improves the anti-corrosion performance of stainless steel and achieves better anti-rust. Practical Design: U-shaped shackle with flat washer and hex nut, the u-bolts are machine threaded on both arms and are designed to fit into two pre-drilled holes, allowing for quicker entry. Useful Tool: Durable stainless steel u-bolts can be used as towing rings, tie down rings, tie down rings and water ski rings for trailers, and can also be used to secure or connect locked parts to pipes, wood, etc. Easy to Use: U-bolts are used to fasten or connect interlocking parts with rectangular wooden and metal objects. Installation and disassembly are easy. You just need to drill holes in the joints to attach the nuts and washers. Wide Range of Uses: U-shaped screws are suitable for cars, households, pipelines, gardens, construction and other uses. You can use u-bolts to attach bicycles, attach pipes, and attach workshop equipment. You can also use u-bolts to tow cars or ships.