Good quality material, plastic box with metal closure (no more plastic closure flaps of the box that break after a few tens of Use) Proper functioning of this key and set torque via the electronic display I checked with a conventional torque wrench. the engine stops automatically when the required torque is reached (150 N / m to 350 N / M) Also effective when loosening, ideal for loosening car wheels (650 N / M) 4 sockets provided with this key are of adequate quality The provision also includes a set of replacement blades ready for incorporation A RECOMMENDED EQUIPMENT