6 IADC 537 Roller Cutters

7 1、2 Roller Cutters

7 7、8 IADC837 Roller Cutters

8 1、2 IADC 437 Roller Cutters

8 1、2 IADC 537 Roller Cutters

9 7、8 IADC 537 Roller Cutters

12 1、4 IADC 437 Roller Cutters

12 1、4 IADC 537 Roller Cutters

12 1、4 IADC517 Roller Cutters

14 3、4 IADC 537 Roller Cutters