Description: These screws and nuts are made of high quality 304 stainless steel , which provides strength and offers good corrosion resistance in many environments. Button head design is ideal for use in confined areas as fixing component, industrial and construction fasteners. There are many length in this 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 as fixing component, industrial and construction fasteners. There are many different length of button head screws that you can use for various purposes and projects. Total 120 pieces screws and 50 pieces nuts for general purpose use will meet your daily basic needs . Used widely on home and office appliance, communication equipment, ship assembly and other machinery industry. Specifications: Material: 304 stainless steel Grade: A2-70 Color: Silver Standard: Metric Screw Type: Hex socket button head Thread: M4 Size & Quantity: M4*6 20pcs M4*8 20pcs M4*12 20pcs M4*16 20pcs M4*20 20pcs M4*25 20pcs M4 Nuts 50pcs Box Size: 13.2 x 7.2 x 2.3cm / 5.19 x 2.83 x 0.9" Package Includes: 120pcs x Screws 50pcs x Nuts