www.acedrills.comExport DepartmentMichael LeePhone: +86 - 0851 - 5526688/+86 - Fax: +86 - 0851 - 5515597
7-3,Xiangzhangnanguo Building,Youzha StreetGuiyang, GuizhouChina, 550005Web Page Link: http://www.toboc.com/acedrillsrocktoolscoltd
Dual-wall Drilling Rods (also called RC Drill Rods)comprises and outer and inner pipe with a sealing system to keep the drill string pressurized. Air is blown between the walls of the inner and outer pipes down to the hammer while the air forces the cuttings back up through the center of the inner piper.
View All Products posted by
Acedrills Rock tools Co.,Ltd