total 11 different computer screws, perfect for computer case, power supply, motherboard, hard drives, fan and floppy/CD-ROM drives fixed installation. Made of high quality brass, steel and fiber paper, steel with nickel and black zinc plated which have superior rust resistance and excellent oxidation resistance. Perfect for computer case, power 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. Whether you are a PC building hobbyist or a professional tech, this set of replacement screw accessories is a necessity and the quantity should last for several projects.