1. When facing the face, wear a protective mask. Drilling on the raw iron casting should wear protective glasses to protect the eyes.
2. The drill head holder should be installed properly.
3. The drill is in a hot state during operation. Pay attention to burning the skin.
4. Drilling φ12mm hand -held electric drilling holes should use side handle pistol drills.
5. Standing on the ladder or work at a high place should be taken to the high place to fall, and the ladder should be supported by ground personnel.
