Steel grit is mainly made of broken steel shot. For different sizes of device products, the size of steel grit used for polishing and rust removal is different. Choose steel grit with moderate hardness and excellent resilience, which can reach every place in the cleaning room, and can also reduce the processing time. The hardness of steel grit is directly proportional to the cleaning speed, but it is inversely proportional to the fatigue life. It is best to use steel shot and steel grit to clean the castings, so that the steel grit can be cast to the corners and the other parts of the steel shot can be cast. In this way, it will also avoid the uneven surface of the casting