B2520 25xD Drill Bit with RI D:3.5

Integral hard metal drill bit 25xD with TiAlN coating, with interior cooling and cut to the right 135 point angle, 30 spiral angle; special cutting geometry for pre-drilling with 3 x D bit, which ensures perfect concentrity; special sharpening of the channels to reduce the coefficient of friction, improving the extraction of vibrate; for work with internal cooling Diameter: 3.5