1. Selection of electric drill size. As the size of electric drill increases, its price will also increase. The size of domestic electric drill is usually 20 mm.
2. Additional function selection of electric drill: There will be some additional functions in the same type. For example, the indication bit of R in the model can be reversed. Its advantage is that it can be converted into reversal when the positive rotation is not feasible. The indication drill of E in the model can be adjusted to speed, and can be adjusted to low speed when high speed is not needed.
3. When you see the promotion of electric drill suit in furniture supermarket, don't get hot-headed and buy it immediately, depending on whether it is practical or not.