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Product Name screw elements Material W6Mo5Cr4V2; 38CrMoAI; MM60,WR5,WR13,WR14,CPM10V,CPM9V,316L,SX737,C276 etc. Color Metal Standard GB ISO 9001 Grade Type 20/30/35/40/52/65/75/85/95/120/135 Brand ...