Double Casing Drilling System

Application Range(DTH hammer type drilling inside the case) It can be widely used in drilling for grouting holes in projests such as cofferdam, foundation and geothermal well and etc. Features: 1.Hardening treatment of the parts surface with longer operating life and excellent anti-wear properties 2.Structure optimization Strengthen the structural 3.Superior performance Smooth with high efficiency Technical Data A B C D E F G outer dia reamed dia inner dia thread drill rod