Tianjin Grand Construction Machinery Technology Co., Ltd. deeply engaged in rock breaking tools more...
We have been in the mining and construction market for many years and is committed to innovative, productive, market leading solutions.View More
Core Barrels are used to cut an annular ring in rock or concrete or reinforced concrete. The center core of the rock or concrete is usually crushed with rock auger. The most important advantage of a core barrel is that it assists to concentrate the torque and crowd force on a small ring of cutting teeth.View More
These Grand tungsten carbide insert bits are used to drill soft formation with low compressive strength and high drill ability, such as shale, clay, sandstone and soft limestone, etc.View More