appropriately relax the machine,the force will be relatively larger,so the drilling hole will be deeper.
3.Pay attention to the cement wall when moving back and forth, control the speed,keep safe or maybe the drilling is already inside,the machine is still running. It is easy to hurt hands.
4.Finally, the drill must be stably installed.It obviously accurs to increase the friction of the drill and damage the wall if the drill bit is easy to shake.China Hardwware Accessories
website:http://www.dingqimaxtool.com/h....ardwware-accessories
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