founded in 2007, located at the foot of Mount Tai shandong province china . Our company ,as a biggest and professional manufacturer rock bolts our country ,can offer best quality to customers , supporting safety mining protecting miners lives .Main products ...

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

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