HSS-R Reduced Shank Jobber Twist Drill Bit Type N. High-Performance rolled, steam-treated drill piece made from heavy-duty black high speed steel.
The manufacturing procedure (no structural disruption) solidifies the material making it more elasticated. This makes it more resistant to fracture and suitable for robust drilling units (e.g. hand-held drilling machines). Ideally suitable for drilling larger drilling diameters on all commonly-used drilling machines with a clamping chuck up to 13.0 mm.
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