1. Selection of the size of the electric drill bit. As the size of the electric drill bit increases, the price will also increase, and the size of the household electric drill bit is generally 20mm.
2. Electric diamond additional function selection: In the same model, there will be some additional functions. For example, the drill with R in the model can be reversed forward. Some E means that the electric drill can be adjusted, and it can be adjusted to the low speed when it does not require a high rate.
3. When you see the promotion of an electric diamond suit in the furniture supermarket, do not heat up, buy it immediately, depending on whether it is practical.
