Specification :

Operative Standards£ºAPI Spec 7
General Description:
1. Drill Bit Type
(1) Classify according to structure and working principle: Drag Bit, Cone Bit, Diamond Bit (including PDC Bit)
(2) Classify according to function: Full Hole Bit, Coring Bit, Enlarging Bit
2. Drill Bit Size Series£º3-3/4 "¡ª¡ª36 "
Common Size£º26 "¡¢17-1/2"¡¢12-1/4 "¡¢8-1/2 "¡¢6-1/8 "etc