The two products complement each other and are more economical and convenient to use in combination.Product use: 1.for grinding and polishing of machinery and equipment such as automobiles, ships, machine tools, etc. 2.for grinding and polishing of all kinds of alloy products, stainless steel products and other metals 3.for furniture and wood products and fine grinding and polishing of jewelry, crafts, etc. Nano sand implantation process electrostatic implantation of silicon carbide, sharp grinding, durable. Nano sand: implantation process:Electrostatically implanted silicon carbide for sharp grinding and durability. Uniform sand grain:The sand is uniform and full, the paper is soft and comfortable to the touch, greatly increasing the friction. Wet and dry sandpaper:The use of advanced waterproof technology, can be dry grinding, can also be wet grinding, and good water resistance, soaked not rotten. Grit Assortments: 80/120/150/180/240/320/400/600/800/1000/1200/1500 /2500/3000/5000 Grit Sandpaper Assortment, total 142PCS , meets all your need from coarse to ultra-fine in water to unlock the surface inside or dry