Thesescrews 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.Fixing component, industrial and construction fasteners.Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry.Specifications:Material: 304 stainless steelA: Cap headB: Button headC: Flat headSize and Quantity:Screws:M5 x 8 10pcsM5 x 10 10pcsM5 x 12 10pcsM5 x 16 10pcsM5 x 18 10pcsM5 x 20 10pcsM5 x 25 10pcsM5 x 30 10pcsNuts 80pcsPackage Includes:80pcs x Screws 80pcs x NutsNote: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 maybe showing slightly different from the real object. Please take the real one as standard.