... 20kg,dimension:5x5-200x200mm 5)Ten-year OEM brass investment casting carbon brush box MaterialsCopper alloy, bronze, brass, ... s requirementsProcessing equipmentsCNC machining center, CNC lathe, grinding machine, automatic lathe machine, , milling machine, drilling machine, EDM, wire ... ..Casting:Silica sol lost wax casting(precision casting,investment casting),Sand casting Machining:CNC,four-axis milling ...