Tivoly step drill bit set HSS 3 parts 4-12 mm / 4-20 mm / 4-30 mm

HSS steel drill bits designed for drilling steel and plastic.
Automatic centering allows easy self-centering of the drill bit even on the smoothest surfaces. Thanks to this, the user does not need to apply excessive force.
Tri-flat shank allows maximum torque transfer and prevents the drill bit from rotating in the drill chuck.