Replaceable head drill body HYDRA with DIN 6535HE NC whistle notch shank, size 51/64" with an overall length of 156.5mm and flute length of 73.5mm according to DORMER standard for 3xD drilling with HYDRA P (R950), HYDRA M (R960) or HYDRA K (R970) diameter 0.7717 up to 0.8071"
For additional details please check the Manufacturer's site: