HighQuality Materials: All computer screws are made of highquality brass, steel, and fiber paper; steel with nickel and black zinc plating offers superior rust resistance and excellent oxidation resistance. Variety of Types: Includes 228 chassis, power supply, motherboard, hard drive, fan, brass mounting screws, and insulating washers. Sufficient Quantity: This set contains a total of 228 screws. With ample quantity and complete variety, you can use it with confidence. Easy to Store: These screws are packaged in a plastic box for convenient and easy storage. Wide Application: Perfect for PC chassis, power supply, motherboard, hard drives, fans, and floppy/CDROM/DVDROM drive secure installation. Material: Metal Quantity: 228 pieces Package Includes: Motherboard conventional copper post (M3 × 6 + 6): 24 pcs Motherboard insulation gasket (red M3 × 8): 30 pcs Motherboard fixing screws (M3 × 5): 30 pcs CDROM set (M3 × 4): 30 pcs Hard drive screw (M3.5 × 5): 30 pcs Chassis handtwist screws (silver M3.5 × 5): 6 pcs Chassis handtwist screw (black M3.5 × 5): 6 pcs Chassis highstrength screw (M3.5 × 6): 24 pcs Conventional chassis fan holder screw (white zinc M5 × 10): 24 pcs Conventional chassis fan fixing screw (black M5 × 10): 24 pcs