www.thedriller.com/articles/91038-dahil-corp-large-diameter-rods

Dahil Corp. Large-Diameter Rods
November 27, 2017
Dahil Corporation’s large-diameter drilling rods with hexagonal joints are designed for profitable large-diameter drilling, to help drilling contractors achieve faster penetration with shrouded rod with hex joints or screw rod with hex joints. They enable drilling crews to remove soil and/or rock cuttings faster, and connect and disconnect the joints more easily. www.jthammer.com