Step drill Ø4-12 mm, HSS. Step 1 mm. Helicoidal flute. Bright, uncoated

4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12mm High-performance drill bit for the fast and intensive drilling of high-strength steels thanks to its helical fluting and self-centring cut. Tri-flat shank enables maximum torque transmission and prevents the rotation of the bit in the chuck. Specially adapted for through-holes.