Replaceable head drill body HYDRA with DIN 6535HE NC whistle notch shank, size 12.0mm with an overall length of 105mm and flute length of 44mm according to DORMER standard for 3xD drilling with HYDRA P (R950), HYDRA M (R960) or HYDRA K (R970) diameter 11.91 up to 12.5mm
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