Material: carbon steel, black galvanized coating Screw size: thread diameter 3.5mm, total length 6mm Package content: 200pcs, weight 134.8g Keep the convenient threaded screws normally used to fix hard drives, power supplies and expansion cards to the computer case The fixing screw can easily replace or add the hard drive to the computer system Suitable for 3.5-inch hard drives, graphics cards, sound cards, PCI bezel fixing screws, DIY modification