Powered by compressed air and spraying the glass beads onto the workpiece surface with high speed and high pressure for shot blasting and surface finish, it will not only avoid marrings on woekpiece surface. But also improve its precision. Possessing the advantages of superb hardness, excellent flowability and free from contamination, the glass beads can be used repeatedly. Therefore they are widely used for cleaning and polishing of hardware metals, plastics, jewels, precision casting, etc. uding the glass beads as blasting media, the processed products will have enhanced durability, impact stength, tnsile strength, correosion resistance and so on. Therefore they are universally applied for fine finish home and abroad.