API Standard Drill Collars of Slick, Spiral and Non-Magnetic Type - China Drill Collar, Drilling Collar | Made-in-China.com
New 9-3/4" O.D. Spiral Drill Collar, Range II for Sale in New Iberia, Louisiana
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4-3/4” OD Spiral Drill Collar PH 6 Connection (Interdril) - Saltire Energy
Drill Collar – SaxonRigs
Drilling Tools Products | Drill Collars
8' O. D. X 2 13/16' ID, 6 5/8 Reg, 150 Ppf Spiral Drill Collar: 8 1/4' Outside Diameter X 2 13/16' Inside Diameter, with Slip Recesselevator Recessno Hard Band - China
What is a Drill Collar
Spiral drill collar with elevator groove and slip groove
Drill Collar
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Drill Collars,Non Magnetic Drill Collars,Spiral Drill Collar With Elevator Groove And Slip-AL OPAL BLUE TRAD.&CONT.LLC