Leading Suppliers Globally for Drill Collars

Certainly, here is a list of some of the prominent global suppliers of drill collars:

1. Vallourec
2. Hunting PLC
3. NOV Grant Prideco
4. TMK
5. Texas Steel Conversion
6. Drillstar Industries
7. Tejas Tubular Products
8. Stabil Drill
9. Superior Drill Collars
10. AFGlobal Corporation

These companies are renowned for their expertise and contributions to the drill collar industry.