Description
SOD 168 mm Retrievable Symmetrix Overburdern Drilling System with DHD350 DTH hammer
Retrievable <span “=””>symmetric drilling system by <span “=””>DTH hammer is designed to drill and case a hole simultaneously through unstable ground conditions. The driver rock drill bits incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, minimizing the disruption of the drill hole’s surrounding.