Premium Material: Self-taping computer replacement screws are made of high-quality carbon steel, oxidative blackening. These small screws are sturdy for long time use. | Sizes & Quantity: 520Pcs computer screws. 26 sizes PC screws, 20Pcs of each size(mm) : M1.2x4, M1.2x6, M1.4x3, M1.4x4, M1.4x5, M1.4x6, M1.4x8, M1.5x3, M1.5x4, M1.5x5, M1.5x6, M1.5x8, M1.7x4, M1.7x5, M1.7x6, M1.7x8, M1.7x10, M2x4, M2x6, M2x8, M2x10, M2x12, M3x4, M3x6, M3x8, M3x10. Sufficient quantity and sizes for daily use and installation need. | Wide Application: These premium laptop screws are perfect for most types of computer, laptop,notebook, such as DELL, Sony, IBM, HP, Toshiba,Samsung, or any other computers with same accessory size. | Plastic Storage Box: The computer screws are packaged in a plastic box. The mark label on the lid will tell you the size of screws, ensuring a quick search for different sizes of screws. | Sufficient quantity and sizes for daily use and installation need. Screws are suitable for most types of laptop,notebook,computer.