Sainko resin composite plate is made of metal powder materials mainly composed of copper, iron and tin and resin. It is very suitable for use with diamond grinding fluid. Its hardness and density are lower than that of copper metal, which is conducive to the embedding of diamond particles, and can maintain a high removal rate without causing large scratches. During the processing, the abrasive will not be pressed into the processing materials. It is suitable for single side and double side precision grinding or hard polishing of various materials.