QuartzProducingExpert-SD ISO9001ISO14001,OHSAS18001 Mintolerance+/-0.2mm quartz part,quartz further processing, quartz pieces Company: Donghai Shengda Quartz Products Co., LtdCertification: ... ,Quartz glass plate, quartz piece,quartz plate,quartz part,quartz further processing, quartz piecesService: We can produce according to your size ...