95TSS doesn’t just sell the best reflective aluminum signs for traffic and construction; we’ve got your hardware, too. This listing is for a 5/16-18 hex flange corner bolts with a serrated washer face. Vibration resistant with a large contact area, these are idea as corner bolts. Get better coverage of 7/16″ hole in square tubing as well as superior corrosion resistance with quality steel zinc plating. A reliable, everyday essential for municipalities, contractors, maintenance crews, and much more. Looking for something else? Stick with 95TSS for signs, posts, stands, and much more.