Electric drills can be divided into three categories: electric hand drills, impact drills, and hammer drills.

1. Hand drill: The power is the smallest, and the scope of use is limited to drilling wood and as an electric screwdriver. It does not have much practical value and is not recommended to buy.

2. Percussion drill: it can drill wood, iron and drill bricks, but not concrete. Some percussion drills indicate that concrete can be drilled, which is actually not feasible, but it is absolute for drilling tiles and concrete with a thin outer layer of bricks. No problem.

3. Hammer Drill 20MM BHD2012: It can drill holes in any material and has the widest range of use.

The prices of these three types of electric drills are arranged from low to high, and their functions increase accordingly. How to choose them depends on their respective scope of application and requirements.

How to choose an electric drill:

Take the indoor ceiling as an example. The ceiling is made of reinforced concrete. If you use a percussion drill to drill holes, it will take a lot of effort. I have used it to drill holes on the ceiling to install lights. As a result, the lights were not installed properly and the charges were lost. Drill bit; but this will not happen if it is used to hit the wall, so the impact drill is suitable for daily use in the family, but for the drilling staff, the hammer drill should be the first choice.

When hitting a wall, a hammer drill will save more effort than a percussion drill. The key is that the structure and working principle of the two are different. I will not quote jargon and terminology to explain here. TX is not interested in this, so I will use the most In plain words, the impact drill needs to be continuously applied with force to make it rotate during use. When using a hammer drill, only a little force is required at the beginning to make the drill move forward automatically.

Precautions for purchasing electric drills:

1. Selection of electric drill size. As the size of the electric drill bit increases, its price will also increase. Personally, the size of the electric drill bit for household use is generally 20mm. However, it depends on individual circumstances.

2. Selection of additional functions for electric drills: the same model will have some additional functions. For example, the R in the model indicates that the drill bit can be forward and reversed. The advantage is that when the forward rotation is not possible, it can be converted to reverse; in the model An E indicates that the electric drill can be adjusted in speed. When a high speed is not required, it can be adjusted to a low speed. Of course, the more functions, the higher the price. The specific choice depends on personal preference.