... Quality system certificate:ISO9001:2008 Type: Sheet-metal Products Speaker box Dongguan Richhong metal Co. Ltd has long history ... , dichromate plating, decrement plating, etc.Machinery and equipmentsCNC machining center; CNC lathe; Normal lathe; CNC milling machine; General milling ... drilling machine; General planning and grinding machine; CNC turning center; Wire EDM, etc. And we also can offer 4 ...