String type  

Near bit

Top  

Down  

Top  

Down  

WL149

5-7/8″

121

51

1200

            NC38

3-1/2REG

WL152

6″

WL158

6-1/4″

WL165

6-1/2″

WL190

7-1/2″

159

57

1600

            NC46

4-1/2REG

WL200

7-7/8″

WL213

8-3/8″

159

165

71

1600

1800

            NC46

            NC50

WL215

8-1/2″

159

165

178

WL222

8-3/4″

WL241

9-1/2″

178

197

1600

  NC50

  NC50

  NC50

WL245

9-5/8″

1800

6-5/8REG

WL251

9-7/8″

WL311

12-1/4″

203

209

76

1800

NC56

6-5/8REG

NC56

6-5/8REG

NC56

6-5/8REG

6-5/8REG

WL406

16″

229

241.3

2000

2200

NC61

7-5/8REG

NC61

7-5/8REG

NC61

7-5/8REG

NC61

7-5/8REG

WL445

17-1/2″

WL609

24″

WL660

26″

WL711

28″