1. Before drilling, mark the position of the hole on the wall with a pencil or chalk, and punch the center of the hole with a center punch; 2. Then select a straight, sharp, non-destructive impact drill bit with the same diameter as the hole; 3. Open the card head, insert the drill bit to the bottom, and tighten the card head with the card head key. Grasp the impact drill with both hands and press the drill tip against the concave hole impacted by the center punch, making the drill bit form a 90 ° angle with the wall; Impact drills are generally not suitable for use as electric drills because: 1. The direction of the impact drill is difficult to grasp during use, which can lead to misoperation and excessive opening; 2. The drill bit is not sharp, resulting in irregular holes, burrs or cracks; 3. Even if there is a conversion switch on top, it is recommended not to drill holes unless you use a dedicated drill bit. However, due to the fast speed of the electric drill, it is easy to blacken the opening and heat the drill bit, thereby affecting the service life of the drill bit.
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