1. It's very simple and lightweight.

2. There are six surfaces in the middle of the socket head screw and wrench, which are under sufficient pressure and not easy to be damaged.

3. It can be used to screw deep holes.

4. The warp and length of the wrench determine its twisting force.

5. Can be used for turning very small screws.

6. It is very easy to manufacture and cost less.

7. Both sides of the wrench can be applied.