【Quality Material】： Sanding blocks are made of high-strength diamond and high-elastic sponge, wear-resistant with strong operating force and can be used repeatedly. 【Coarse and Fine Polishing】： Sanding blocks, suitable for various materials, from coarse to fine. The finer the sand, the better the grinding effect; the coarser the sand, the better the polishing effect. 【4 Types of Grits】： 60# is used for general slabs and floor tiles, 100# is used for ordinary tiles, 200# is used for glass, and 400# is used for fine polishing. 【Widely Used】: 4Pcs sanding sponges, widely used in stone polishing, tile cutting, glass burr cutting, metal polishing and renovation, wood deburring 等。 【Side Groove】: Side groove design is more convenient, easy to use. Help you Quickly solve the problems you often encounter in life such as chipping, burrs, edges, etc.