Abstract: A screw driving member of the present invention is driven by a power tool to turn a nut with a polygonal head and a slot on its top. The screw driving member includes a shaft, a driver head and a biasing device. The shaft has an axial hole and a fitting hole. The driver head is inserted into the axial hole of the shaft for reciprocation but rotation. The biasing device urges the driver head to have a coupling end out of the shaft. In engagement of the nut, the coupling end enters the slot of the nut, and then the driver head will be turned automatically that the coupling end may fully enter the slot. At the same time, the shaft is turned also that the fitting hole may be engaged with the head of the nut when the screw driving member is pressed downward.

Abstract: A tire pressure gauge includes a housing, a tire pressure detection unit, an air valve, and at least two limit members. The housing has a lateral side and a chamber. The tire pressure detection unit is mounted in the chamber. The air valve is mounted to the housing, extending out of the chamber from the lateral side of the housing. The at least two limit members are mounted to the lateral side of the housing and located bilaterally at the air valve, each having an end surface to which the air valve is perpendicular. Accordingly, when the tire passes through the rough roadbed to be violently shocked or impacted, the tire pressure gauge of the present invention remains in original position because of positioning efficacy of the two limit members.