Usage Tips:Description: These screws and nuts are made of 304 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 inventions. Features: Made of 304 stainless steel material, the 304 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. Well packed and assorted in a transparent plastic box for convenient use and storage. Eight common sizes for general purpose use, meet daily basic needs. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. Specifications: Material: 304 stainless steel Type: Flat head hex socket Size and Quantity: M4 x 6 10pcs M4 x 8 10pcs M4 x 10 10pcs M4 x 12 10pcs M4 x 14 10pcs M4 x 16 10pcs M4 x 20 10pcs M4 x 25 10pcs Box Size: 12.5 x 6.3 x 2.3cm / 4.92 x 2.48 x 0.9" Weight: 145g(approx.) Package Includes: 80pcs x Screws Note: 1. Please allow 1-2mm 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.