1. When facing up, wear a protective mask. Protective glasses should be worn to protect eyes when drilling holes in pig iron castings.
2. Bit holder should be properly installed.
3. When the drill is in a burning state, attention should be paid to burning the skin.
4. Hand-held electric drill with side handle should be used when drilling 1.4 12 mm or more.
5. When working on a ladder or at an altitude, measures for falling should be taken, and the ladder should be supported by ground personnel.
