[Quality Material]: These PC screw are made of carbon steel which is rustproof, anti-aging ,strong and lightweight.rustproof, anti-aging ,strong and lightweight. [Widely Application]: These screws are suitable for all universal computer construction or repair.For motherboard,PC casing, supply, hard drives, fans and fixed installation of floppy disks/CD-ROM/DVD-ROM drives. Perfect for PC case, supply, motherboard, hard drives, fan and floppy/CD-ROM/DVD-ROM drives fixed installation, they are placed in a box, easy to find and use Colour:As shown Material:metal Package Contents: 6 x Chassis hand screws (M3.5 x 6, Silver) 6 x Chassis hand screw (M3.5 x 6, black ) 30 x Conventional chassis fan screw (M5 x 10, Silver) 30 x Conventional chassis fans hold screw (M5 x 10, black) 24 x Chassis high-strength screw (M3.5 x 6) 40 x Hard drive screws (M3.5 x 5) 40 x Motherboard fixed screws (M3 x 5) 40 x CD-ROM screws (M3 x 4) 24 x Motherboard conventional copper column (M3 x 6 + 6) 40 x Circuit board insulation washer (M3 x 8, red) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.