Thesescrews and nuts are made of 304 stainless steel, which is resistant to rust and corrosion.There are many sizes 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.Environment-friendly, no pollution, high hardnessfixing component, industrial and construction fasteners.Six common sizes for general purpose use, meet daily basic needs.Well packed and assorted in a transparent plastic boxfor convenient use and storage.Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry.Specifications:Material: 304 stainless steelType: Button head hex socketSize and Quantity:Screws:M3 x 6mm 50pcsM3 x 8mm 50pcsM3x 10mm 50pcsM3x 12mm 50pcsM3x 16mm 50pcsM3x 20mm 50pcsNuts 300pcsBox Size: 12.5 x 6.3 x 2.3cm / 4.92 x 2.48 x 0.9"Weight: 330g(approx.)Package Includes:300pcs x Screws 300pcs x NutsNote: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 beshowing slightly different from the real object. Please take the real one as standard.