Drill Collar

4145H Quenched & Tempered Steel

Slick

Spiral

NC23-31 NC26-35(2 3/8 IF) NC31-41(2 7/8 IF)

NC35-47 NC38-50(31/2IF) NC44-60

NC44-60 NC44-62 NC44-62(4IF)

NC44-65(4IF) NC44-65(4IF) NC44-67(4IF)

NC50-67(41/2IF) NC50-70(41/2IF) NC50-70(41/2IF)

NC50-72(41/2IF) NC56-80 NC61-90

NC70-97 NC70-100

Spiral Drill Collar with elevator groove & slip

Non Magnetic Drill Collar