steel grit manufacture

How to select a steel grit manufacture? Put the key words of steel grit manufacture, steel grit shot or steel shot ect. You can find many grit shot manufacures. But how to choose your espected factory? Different people have different advice. But my idea is first to check the capital. The bigger the better. Second is to check their credit. Third is to check by other browsers. And see if there have record about that company. And in the last, check with the local departments to see whehter it is a good factory. If it is possible to visit the factory directly.