Blister of 1 Cobalt Technic metal drill bit graduated D8 mm, for quick and accurate drilling. Fast and accurate drilling of the most resistant metals: thanks to its high quality and the control of its cross-point sharpening. Long service life: thanks to the high quality of its HSS steel in Cobalt and its thermal treatment. Optimum chip evacuation: thanks to its specific "NFO" stud. Depth control: thanks to its laser graduation, this patented technology helps control the depth during drilling.