Our flange nuts come in metric sizing and are made in zinc plated alloy steel. The nut size matches the size of the screw exactly, so make sure to order the same size as your screws! Monster Bolts is proud to offer some of the best nuts, bolts, screws, washers, and other materials available online—all at an affordable price. If you have any questions about our products or services, we would be happy to tell you more. Contact us today, and order your flange nuts for your next project!