According to the cement grade, the hardness of the cement wall is also different, and the cement nails with good hardness can not be nailed in. So how to deal with this situation? Cement nails, as the name implies, are specially designed to nail things on hard media such as cement walls or brick walls, but sometimes cement nails are not so easy to use. The cement grade is different, and the hardness of the cement wall is also different. At present, many cement nails sold in the hardware store can't be nailed in at all. One nail, the other end is knocked off or the nail body is bent. If some walls can't be nailed into the cement nail, change the way out, change the idea, expansion bolt or expansion bolt can be used. No matter how hard the wall is, it can handle the expansion bolt or expansion bolt. The role of the expansion bolt or expansion bolt is very wide, and the model is also different. So it can basically adapt to any wall surface and objects with different weights. However, when using the expansion bolt or expansion bolt, it also needs auxiliary tools, that is, electric drill, The head of the electric drill corresponds to the model of the expansion bolt one by one, so it is necessary to have the electric drill. The electric drill is actually very easy to use. Basically, you can use it a few times. So it is better to use the expansion bolt or expansion bolt to hang a photo, wedding photo and other series of things. Whether it is a cement nail or an expansion bolt, it can be used as long as it is useful. However, at present, the cement nail is becoming more and more difficult to use. The cement wall can't be nailed in at all. What is the cement nail