- Drill Collar
- 2016-10-03 05:08
- Specifications1.Used for oil well drilling 2.OD:60~139.7mm 3.WT:7.11~10.54mm 4.Standard:API 5DPNo.SizeGradeUpsettingStan
- Square Kelly
- 2016-10-03 05:08
- Our company offers square kellys. Kellys are available up to 46 feet long.Our kellys are made from 4145H modified alloy