Specification: Material: carbon steel Size: M3*8mm, M3*12mm, M3*16mm, M3*20mm, M3*25mm, M4*10mm, M4*12mm, M4*16mm, M4*20mm, M4*25mm Type: M3, M4 self-tapping screws with washers Color: black Quantity: 280pcs Note: Please allow 1-3cm measuring deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Feature: Premium MaterialThese self-tapping screws are made of premium carbon steel with zinc plated finish, which is sturdy, not easy to break, have strong rust resistant and corrosion resistant even in humid environment. Self-tappingIntegrated molding design of screw head and washer, it is more convenient to use. These self-tapping screws with sharp point can easy pierce through drywall, and the head allows for quick and easy countersinking and self-tapping into the wood, furniture. Package Content The package includes 280pcs 10 types self-tapping screws, 40pcs M3*8mm, 35pcs M3*12mm, 30pcs M3*16mm, 30pcs M3*20mm, 20pcs M3*25mm, 30pcs M4*10mm, 30pcs M4*12mm, 25pcs M4*16mm, 20pcs M4*20mm, 20pcs M4*25mm. Easy To CarryOur self-tapping screws are equipped with a plastic storage box. All screws assortments are put in the transparent plastic storage box, which can ensure long time using, and convenient for collect and use. Wide ApplicationThese self-tapping screws are widely used in electronics, electrical equipment such as machinery and equipment, furniture, and many other areas, ideal for use in your home, office, or workplace. Package Including: 40* M3*8mm 35* M3*12mm 30* M3*16mm 30* M3*20mm 20* M3*25mm 30* M4*10mm 30* M4*12mm 25* M4*16mm 20* M4*20mm 20* M4*25mm