Italy quality glass processing cup diamond wheel Manufacuturer Best quality Ten years' export experiences ISO ... 2001:2008 Italy quality glass processing cup diamond wheel Feature good sharpness, long product life, good stability ... 100, 120, 150, 180, 240, 320 CompanyEstablished in 1998, Zhengzhou Longda Abrasives Co., Ltd is a specialized enterprise that engages in the research ...