Material: High Quality brass and steel, which have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using. Size : Total 228pcs,10 different computer pc screws, different screw can meet your different needs, perfect for PC case, power supply, motherboard, hard drives, fan and floppy/CD-ROM/DVD-ROM drives fixed installation Computer fixed screws assortment kit, standoffs kit, conventional copper column, insulating pad, total 228pcs PC mounting accessory