Total 10 different computer screws,all black color,400pcs in a box,easy to distinguish,meet all your needs Material:Made of high quality carbon steel,black zinc plated which have superior rust resistance and excellent oxidation resistance Package included:SSD screw,fan screw,Insulating Gasket,Standoffs,Thumbscrews,Hard drive screws,Motherboard Screws,High-Strength Screws,Screwdriver This computer fixed screws assortment kit are good for PC building hobbyist or a professional tech for personal computer assembling Widely Applications:Perfect for PC case, power supply, motherboard, hard drives, fan and floppy/CD-ROM/DVD-ROM drives fixed installation