Quality Materials: All computer screws are made from high-quality brass, steel, and fiber paper, with steel featuring nickel and black zinc plating for superior rust resistance and excellent oxidation resistance. Various Types: Includes 228 pieces of chassis, power supply, motherboard, hard drive, fan, brass mounting screws, and insulating washers. Sufficient Quantity: Our set contains a total of 228 screws. With ample quantity and 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 chassis, power supplies, motherboards, hard drives, fans, and floppy/CD-ROM/DVD-ROM drive fixed installations. Material: Metal Quantity: 228 pcs Package includes: Motherboard conventional copper pillar (M3 × 6 + 6): 24 pcs Motherboard insulating gasket (red M3 × 8): 30 pcs Motherboard fixed screws (M3 × 5): 30 pcs CD-ROM set (M3 × 4): 30 pcs Hard drive screws (M3.5 × 5): 30 pcs Chassis hand-tightening screws (silver M3.5 × 5): 6 pcs Chassis hand-tightening screws (black M3.5 × 5): 6 pcs Chassis high-strength screws (M3.5 × 6): 24 pcs Conventional chassis fan mounting screws (white zinc M5 × 10): 24 pcs Conventional chassis fan fixing screws (black M5 × 10): 24 pcs