These screws and nuts are made of A2 stainless steel, which is resistant to rust and corrosion.There are many length in one set which can be commonly used in home and office appliance, machinery, furniture, repair and DIY inventions. Features: Made of A2 stainless steel material, the A2 stainless steel material provides strength and offers good corrosion resistance in many environments. Ideal for use in confined areas where the head needs to be flush or below the surface. Fixing component, industrial and construction fasteners. Six common sizes and three optional types for general purpose use. Used widely in the home and office appliance, communication equipments, ship assembly and other machinery industry. Specifications: Material: A2 stainless steel Type(optional): A: Cap head B: Button head C: Flat head Size and Quantity: Screws: M3 * 6 25PCS M3 * 8 25PCS M3 * 10 25PCS M3 * 12 25PCS M3 * 16 25PCS M3 * 20 25PCS M3 Nuts 100PCS Package Includes: 150pcs x Screws 100pcs x Nuts Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.