ZHENGZHOU ROCK AUTO PARTS CO.,LTD was first established in 2007.The main business was casting iron,casting steel,casting aluminium,casting copper in the beginning.We have supplied the casting product to America,Canada and Australia for about 4years. At 2009.we have changed the policy to produce whole and high-tech auto parts.The main product in this decade is throttle body,valve,starter.alternator and other parts. At 2012,we get support of i...