Quality Materials: All computer screws are made of high-quality brass, steel, and fiber paper, with steel featuring nickel and black zinc plating for superior rust resistance and excellent oxidation resistance. Different Types: Includes 228pcs for computer cases, power supplies, motherboards, hard drives, fans, brass standoff screws, and insulating washers. Sufficient Quantity: Our set contains a total of 228 screws. With ample quantity and a complete variety, you can use them with confidence. Easy to Store: These screws are packaged in a plastic box, making them convenient for storage and easy to keep organized. Wide Application: These hard drive screws are perfect for PC cases, power supplies, motherboards, hard drives, fans, and floppy/CD-ROM/DVD-ROM drive fixed installations. Material: Metal Quantity: 228pcs Package Includes: Motherboard conventional copper column (M3 × 6 + 6): 24pcs Motherboard insulation gasket (Red M3 × 8): 30pcs Motherboard fixed screws (M3 × 5): 30pcs CD-ROM screws (M3 × 4): 30pcs Hard drive screws (M3.5 × 5): 30pcs Chassis hand-tighten screws (silver M3.5 × 5): 6pcs Chassis hand-tighten screws (black M3.5 × 5): 6pcs Chassis high-strength screws (M3.5 × 6): 24pcs Conventional chassis fan retaining screws (white zinc M5 × 10): 24pcs Conventional chassis fan retaining screws (black M5 × 10): 24pcs