Patent ID: 8215209

Claim:
A screw driving member, which is driven by a power tool to turn a nut with a polygonal head and a slot on a top of the head, comprising: a shaft having a coupling portion to be connected to the power tool and a driving portion having an axial hole and a fitting hole to be engaged with the polygonal head of the screw, wherein the axial hole and the fitting hole are coaxial; a driver head, which is engaged with the axial hole of the shaft for anti-rotation, having a coupling portion to be engaged with the slot on the polygonal head of the screw, wherein the driver head is moved between a first position, in which the coupling portion of the driver head is out of the axial hole of the shaft, and a second position, in which the coupling portion of the driver head is received in the axial hole of the shaft; a biasing device received in the axial hole of the shaft to urge the driver head toward the first position; and further comprising a pin, wherein the shaft is provided with at least a guiding slot on the driving portion, and the pin is inserted through the driver head and enters the guiding slot.