主权项 |
1. A hole saw, configured to rotate about a central shaft and comprising:
a circular saw blade, made by rounding a lengthwise rectangular metal sheet and connecting two ends thereof to define therein an accommodating space, and having one edge provided with a plurality of sawteeth and an opposite edge provided with a connecting portion; and a cover plate, covering the connecting portion of the circular saw blade and having a base, a positioning portion and a shoulder, wherein the positioning portion extends from the base toward the connecting portion, and the shoulder is formed between the base and the positioning portion. |