Cement screws, commonly known as steel nails, is a kind of nails, made of carbon steel, its material has No.45 steel or No.60 steel, its produced by the processes of wire drawing, annealing, nail, quenching, so it is quite hard. Its function is to nail in some relatively hard object while other nails can not nail, because the material is very different from ordinary nails, it is special used nail. Cement nail is very hard, thick and short, and its penetrating ability is very strong. There is screw hole or thread at the back of the cement screws. When used, hammer the cement screw into the cement, and then install the object with ordinary screws or nuts. It is easy to install and removable. It solves the problem that cement screws cannot be removed, and is applicable to the installation of cement which the object may be removed.