corner-rounding counterbore / solid / thread / coated
Gewindeschneid-Werkzeugfabrik GSR Gustav Stursberg GmbH
Couterbores for sinking until a diameter of 5 mm have two main cutting edges and sinker for sink diameters larger than 5 mm up to 20 mm have three or more main cutting edges. They are Right hand cutting and have a fixed pilot for guidance in a
through hole or core hole.