- Heavy Weight Drilling Collar
- 2016-11-06 19:17
- Drill Collars are the most important parts of all drilling string elements. The performance of drill collars will effect
- Steely Pumping Rod -3
- 2016-10-31 06:07
- Steely pumping rod (level D):1. Standard: API SPEC 11B2. Material: Alloy steel3. Features: High strength, better plastic