Bathroom Hardware,Bathroom Hardware Sets,Modern Bathroom Hardware,Bathroom Hardware Accessories JIAHAOJIA SANITARY WARE INDUSTRY CO., LTD. , https://www.gagalfaucet.com At present, although the suction cups used on the surface grinder are of various types, they are all electromagnetic type. Due to the manufacturing reasons, the suction of the electromagnetic chuck is small and uneven, and a certain unsafeness is lurking during work. With the development of permanent magnet materials, in recent years, in order to save energy, simplify structure, remove noise, etc., domestic and foreign are pleading to use permanent magnet chucks instead of electromagnetic chucks for half a century.