Operative Standards:API 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:3-3/4 "——36 "
Common Size:26 "\17-1/2"\12-1/4 "\8-1/2 "\6-1/8 "etc