Henan Yinwang Trade Co., Ltd. loated in zhengzhou city of Henan Province. Our main products include : 1. Synthetic diamond ( big size hpht diamond, small size diamond grit, diamond powder and so on ) 2. Diamond tools ( diamond cutting wheel, superthin diamond cutting wheel, diamond dicing blade, internal grinding wheel and so on ) Adhering to the motto of "build the business on mutual trust and benefit", we endeavor to provide our customers with reliable products, comprehensive ...