GREAT's High-quality Bits Series I

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...

Overview 120 ° U-shaped Roller bitGREAT has customized manufacture several types of roller bit . The traditional roller bit was cut by tricone bit . So it is including No.1 ,No.2, No.3 Cone cutters ....

Popular Size: 1305, 1308,1613,1616,1913