Quality Material: The computer replacement screws are made of premium carbon steel, oxidative blackening. These small screws are sturdy and long-lasting in daily use. | Dimension & Quantity: Total 520pcs notebook screws. 26 sizes PC screws, 20pcs of each size(mm) : M1.4x4, M1.4x6, M1.4x8, M1.7x4, M1.7x5, M1.7x6, M1.7x8, M2x4, M2x6, M2x8, M2x10, M2.5x4, M2.5x5, M2.5x6, M2.5x8, M2.5x10, M2.5x12, M3x4, M3x6, M3x8, M3x10, M3x12, M3x14, M3x16, M3.5x5,M3.5x6. | Widely Used: These micro screws are suitable for various types of laptop, computer, notebook, such as HP, Sony, DELL, IBM, Acer, Toshiba, Samsung, Asus, Lenovo. The screw combination kit for fixed installation of SATA, SSD M.2, motherboard, fan, hard drives. | Easy to Store: You will get 520pcs screws in a plastic sorting box. So easy for you to sort and organize laptop screws. The label on the lid will tell you the size of the screw, make a quick search for screws of different sizes. | Enough quantity and sizes for installation needs. These screws are suitable for most types of computer, laptop, notebook.