... . Drilling Rigs for mineral exploration, soil investigation and water well drilling, etc. The drilling machines are available for the hole depth from ... rod, Use Chinese Exploration material 45MnMoB, with heat treatment coupling and box. D. Core Barrel (AQ Core Barrel, BQ Core ... shoes) 4. DTH hammer bits, similar or equal DHD, COP and SD series hammers; Core Drilling Machines and Core Drilling Tools