| 摘要 |
A cutter comprises a cutter handle, a cutter neck and a cutter head. The cutter neck interconnects the cutter handle and the cutter head. The cutter head comprises a connecting side surface adjoining the cutter neck, an outer annular surface, a distal end surface opposite to the connecting side surface and away from the cutter neck, and at least one cutting edge formed on the outer annular surface extending from the junction of the connecting side surface and the cutter neck toward the distal end surface, and at least one cutting trough formed on the cutter head adjacent to the at least one cutting edge extending from the junction of the connecting side surface and the cutter neck toward the distal end surface. |
