1)brass carbon brush box 2)CNC,CMM 3)ISO9001:2000,ERP management ... ,dimension:5x5-200x200mm 5)Ten-year OEM brass investment casting carbon brush box MaterialsCopper alloy, bronze, brass, other materials can according ... :anodize,polishing,sand blaster,heat treatmentInspection equipment:CMM,X-ray detector,spectrum analysis instrument,metallurgical analysis,tensile strength tester,hardness tester ...