Single and Double Side Polishing Machines and CMP (Chemical Mechanical Polishing) used for the polishing of double and Single surfaces of metal parts, such as valve plate, rigid seal ring, cylinder piston ring and oil pump blade, as well as laminated non-metal parts of hard & brittle materials like silicon, germanium, quartz, glass, ceramic, sapphire, gallium arsenide, ferrite, lithium niobate, etc.