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The DHD Shanks are applicable for underground mining as well as down the hole rock drilling tasks in the construction industry. These are provided with tungsten carbide inserts of optimum quality. The bits of these are made from high grade steel by making the use of state-of-the-art CNC machinery and effective heat treatment process. As the piston stands in direct contact with the drill spot, a very less amount of energy energy is lost. This enables a constant penetration rate in the DHD Shanks, regardless of hole dimension. These have availability in concave and flat face designs.