... efficiency. Polish stainless steel,glass,marble,crystal,jade ware ,precision instrument,the medicial instument,the special machine parts,the ... performance.Company IntorductionEstablished in 1998, Zhengzhou Longda Abrasives Co., Ltd is a specialized enterprise that engages in the research, ... and sales of various kinds of top-class polishing tools which keep ahead in Chinese market. Our target: Advanced ...