Description: These screws and nuts are made of alloy steel.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 alloy steel material, the alloy steel material provides strength. 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: Alloy steel Type(optional): A: Cap head B: Button head C: Flat head Size and Quantity: Screws: M3 * 4 25PCS M3 * 5 25PCS M3 * 6 25PCS M3 * 8 25PCS M3 * 10 25PCS M3 * 12 25PCS M3 Nuts 50PCS M3 Flat Washers 50PCS M3 Spring Washers 50PCS Package Includes: 150pcs x Screws 50pcs x Nuts 100pcs x Washers 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.