7degree drill rod we can provide Hex22-7° and Hex19-7° Hex25-7° the shank we have 108mm and 159mm we can produce according to the requirement of our customer , the material of the drill rod we have 95CrMo. 55SiMnMo, 45SiMnCrNiMo , and 23CrNi3Mo etc , the part of the taper we use CNC machine tools for processing ,Ensure the smoothness and accuracy of the drill steel .
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