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As a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”). the limiting factor is the outside diameter of the hammer, because as the hole diameter reduces due to diameter wear of the bit, airflow is restricted.

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The optimum range of hole size for dth drilling is 90 mm (3.5”) to 254 mm (10”). smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. as a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”).

We're an enterprise that export Mission Bit wholesale in Egypt to China, we are authorized by the relevant state registratio. Key Mission Bit wholesale in Egypt and sell to many regions in China, solution offered upon request. We've got the spirit of "customer very first, honesty first" principle, with a quantity of enterprises established long-term cooperative relationship.


We attach value to innovation, specifically with patents of China on Mission Bit wholesale in Egypt, its excellent technology has reached the international sophisticated level, and features a higher reputation inside the Mission Bit wholesale in Egypt industry. Our group not merely has outstanding researchers and sector nationwide sales and service network, but also are China clients specified brand producers.

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