The hexagonal shape has 6 sides, which provides good granularity of angles for a tool to approach from. Made of zinc-plated carbon steel, which provides strength, and a zinc coating offers good corrosion resistance. Used to mount bolts, studs, or machine screws to fasten two parts together to make them one piece. These hex nuts are perfect replacements for industrial and construction fasteners. Widely used in the home and office appliance, communication equipment, ship assembly, and other machinery industries.