Precautions:
1. The hole opener is suitable for angle grinders. It can be directly used on electric drills and bench drills after being equipped with a connecting rod. Since the hole opener does not have a central positioning drill bit, it must first be slowly inclined at a 45 degree angle to contact the marble to open the crescent socket Then use this crescent socket for positioning, and then drill vertically, at a speed of about 800-1000 revolutions per minute.
2. Coolant or water needs to be added during the opening process to extend the service life.
3. Please stop working when chip removal is not ideal, and work again after cleaning.