Features Used As A Fixed Component: The button head hex socket screw bolt nut is very suitable for fixed components, which is an industrial and architectural fastener accessories. Level 10.9 High -intensity: This is a set of M3 button head screws and nuts, which has the characteristics of 10.9 high strength, strong and stable characteristics, and strong practicality. Widely used: The hexagonal screws in the round head are widely used in family and office equipment, communication equipment, ship assembly and other mechanical industries. Multimary Type: Screw with a nut combination kit is the design of the inner hexagonal and round head. How long is the size, you can use it for different screws. A Total of 300 Screws and Nuts: Each set of 300 screws and nuts, widely used, will meet your daily needs, with a storage box. Features: 1.This is a set of M3 button head screws and nuts with 10.9 grade high strength. 2.Great for use in confined areas as fixing component, industrial and construction fasteners. 3.There are many different length of screws that you can use for various purposes. 4.Total 300 pieces of screws and nuts for general purpose use will meet your daily basic needs. 5.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*5   20PCS M3*6   20PCS M3*8   20PCS M3*10  20PCS M3*12  20PCS M3*14  20PCS M3*16  20PCS M3*18  20PCS M3*20  20PCS M3 NUT 120PCS Weight: 200g / 7.1oz (approx.) Package list: 1 box * Screws and Nuts Package List