GREAT's High-quality Bits Series II

Core barrel with roller bit is used in very strong rock formations(compressive strength > 100Mpa)

Normally drag bits are 3 wings, but we can make 4 or 5 wings following your drawings or samples.

Raise Boring Cutters OverviewThe raise boring cutters is mainly used for the construction of vertical shafts, ventilation shafts inclined shafts, pressure regulating shafts and escape shafts , and it...

PDC Reamer is the perfect tool for large diameter HDD bores. The size of the reamer is ranging from 12" to 50".