Are you searching for a reliable and durable solution for mounting brackets to a trailer frame? Tie Down Engineering's zinc-plated U-bolts are the answer you've been looking for! With their square shape and 3-1/8" leg length, these U-bolts are designed to provide a secure and stable mounting solution for your trailer brackets. Plus, with their included flat washers and nyloc nuts, you'll have everything you need to get the job done right. At Tie Down Engineering, we're committed to providing our customers with the highest quality products for a variety of applications, from marine to industrial and beyond. With over 50 years of experience and a dedication to innovation, we're a trusted name in the industry.