1. This screw nut assembly toy contains 167 accessories, which can be assembled into 10 different shapes (10 cannot be assembled at the same time). We have provided instructions to help children assemble smoothly. In the process of assembling, children not only exercise their mental intelligence, but also improve their hand eye coordination ability. 

2. This is mainly the assembly of engineering vehicles, helicopters, robots and other shapes. It is connected by screws and nuts. The whole is full of scientific and technological sense and mechanical sense, which satisfies the boys' enthusiasm for engineering machinery. 

3. High quality plastic, wear-resistant and durable. 

4. It is equipped with a storage box. After children play, they can store the remaining accessories to exercise the children's sorting awareness and storage ability. It is convenient to carry the cassettes. Children can bring toys to play with their friends to promote their social skills. 

5. In the process of assembling children, parents can participate together to enhance parent-child interaction and strengthen parent-child relationship. 

6. Exercise fine finger skills.