Features Made of alloy steel material, the alloy steel material provides strength The fastener repair tool is ideal for use in confined areas where the head needs to be flush or below the surface Fixing component,this hexc socket screw nuts are industrial and construction fasteners Six common sizes and three optional types for purpose use Used widely in the home and office appliance, communication equipments, ship assembly and other machinery industry 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. Specifications: Material: Alloy steel Type(optional): A: Cap head B: Button head C: Flat head Size and Quantity: Screws: M3 x 6mm     25pcs M3 x 8mm     25pcs M3 x 10mm   25pcs M3 x 12mm   25pcs M3 x 16mm   25pcs M3 x 20mm   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. Package List