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This type of Bi-center bit mainly used for medium to medium hard compressive and abrasive formation.

GREAT DRILL customized Rock reamers size from 10'' to 72''.

RC PDC bit from GREAT are manufactured from AISI 4145H heat-treated steel.

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 ....