Shandong Tongrui Mining Technology Co.,Ltd was founded in 2007 in Tai an, Shandong, China. In 2011 we set up GSI(Ground Support Industries Co.,Ltd) for selling and promoting the products of Tongrui under the brand name of Tightlok. Our office and factory are very near to both Qingdao and Tianjin Seaport, which makes the exporting of our products effectively, economically and quickly.



We are a very professional Ground Support Products Manufactory. Over the years, by working together with many famous technicians and experts including professors from ShanDong Science &...