Patent ID: 8449226

Claim:
A throw-away insert including a first surface and a second surface facing each other, a side surface being formed between said first surface and said second surface, said throw-away insert comprising: a first ridge line formed at a position where said first surface and said side surface intersects; and a second ridge line formed at a position where said second surface and said side surface intersect; wherein: said first surface acts as a first rake face and said first ridge line forms a first cutting section; said side surface acts as a second rake face and said second ridge line forms a second cutting section; and selection can be performed between said first cutting section and said second cutting section, and wherein chip breakers are disposed at a region of said first surface along said first ridge line and a region of said side surface along said second ridge line, wherein said first surface and said second surface have different shapes, and there are no chip breakers on said second surface.