We, Shandong ZHONGRUI Construction Co., Ltd (registered trade mark "ZR" rock drilling tools, hereinafter referred to as ZHONGRUI) is an ISO9001 certificated manufacturer of various high quality rock drilling tools wildly used in mining, quarrying, construction, geothermal system, well drilling… We've involved in professional manufacturing, R&D, distribution and supplying in this field for many years. From sales network's establishment, ZHONGRUI focuses on improving products' quality and reducing cost in order to serve customers good products and more benefit. It is just because of this, our products are famous in market.