Description: A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten two or more parts together. The two partners are kept together by a combination of their threads' friction, a slight stretching of the bolt, and compression of the parts to be held together. Features: These hex nuts are made of zinc plated carbon steel material, the carbon steel material provides strength and zinc cover offers good corrosion resistance in many environments. Hexagonal shape has 6 sides that gives a good granularity of angles for a tool to approach from. There are five common size of hexagonal nut that you can choose for general purpose use. These hex nuts will be great replacement for industrial and construction fasteners. Used widely in the home and office appliance, communicationequipment, ship assembly and other machinery industry. Specifications: Material: Zinc plated carbon steel Class: 8.8 Standard: DIN934 Color: Black Size and Quantity(Optional): M2 x 100pcs M2.5 x 100pcs M3 x 100pcs M4 x 100pcs M5 x 100pcs Package Includes: 1 set x Nuts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.