Features: The machine applies pressure with spring. Its manual plate type lifting structure is dexterous, with flexible gyration, convenient operation, stable working and long service life. The triangle abrasive material can be replaced at will to realize rough and fine polishing, and the diamond grinding disc or resin abrasive material can also be replaced for coarse grinding and fine polishing. The degree of finish of polishing is more than 100, applicable for grinding and polishing of slabs with the thickness not changed frequently.