Due to the special plate structure of the spanner part, a nut/bolt does not fall.
It can insert a bolt sideways to a narrow place while holding a bolt with a spanner or it can rotate a bolt with a strong torque while putting some muscle and fastening over.
The double hex structure of the spanner part can rotate a stripped or rust bolt that cannot be rotated with a typical spanner.
The gear part with 80 teeth enables smooth movement.