1. On the new tools must be installed when the tool is to try whether the beating, beating, then can not directly work, to adjust to not jump to use. Otherwise the tool is quickly worn out, carving out things are not very smooth. How to adjust: Use the small wrench with the change chuck to gently tap the high speed turning tool handle until the tool is smooth. The electronic machine is strictly prohibited to beat, the adjustment method is to loosen the chuck, turn the tool angle or extend and indent one points.
2. Be sure to cool the water (like a drip device in a hospital), such as dry drilling, the diamond on the head of the tool is graphitized by overheating, and it is quickly worn out.
3. When drilling, try to avoid shaking, because the shaking will cause local damage to the tool, and accelerate the damage of the entire tool.
Package included :

20 Pcs Diamond Grinding Head