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