1This is a set of M3 button head screws and nuts with 10.9 grade high strength. 2Great for use in confined areas as fixing component, industrial and construction fasteners. 3There are many different length of screws that you can use for various purposes. 4Total 300 pieces of screws and nuts for general purpose use will meet your daily basic needs. 5Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. Features: This is a set of M3 button head screws and nuts with 10.9 grade high strength. Great for use in confined areas as fixing component, industrial and construction fasteners. There are manydifferent length of screws that you can use for various purposes. Total 300 pieces of screws and nuts for general purpose use will meet your daily basic needs. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. Specification: Type: Button head hex socket Strength: 10.9 grade Color: Black Size & Quantity: M3*520PCS M3*620PCS M3*820PCS M3*1020PCS M3*1220PCS M3*1420PCS M3*1620PCS M3*1820PCS M3*2020PCS M3 NUT120PCS Weight: 200g / 7.1oz (approx.) Package list: 1 box * Screws and Nuts