Water drill open holesTricks for dry and wet drilling: Whether dry or wet drilling, do not drill straight at the start. First, angle the drill bit to abrade the wall. Note: Press and release the switch, utilizing the inertia during power outages to abrade the wall. Once a crescent-shaped groove appears on the wall, gradually straighten the drill bit until it forms a complete circle. After forming a circle, press the switch and apply moderate pressure.

  Inner Mongolia water-jet drilling, keep the shoulders tight and the hand only responsible for turning and holding. The downward pressure should be applied with the shoulders. When the depth is reached, pull out and insert the drill bit, an action you should be familiar with. This is done to pull out the powder inside without increasing friction on the drill bit. If you feel the drilling speed is very slow, please pull out the drill bit to check for any broken bricks or cement wall chips. As you near completion, be mindful to reduce the downward pressure to avoid bursting out or damaging the outer wall.