Patent ID: 8544368

Claim:
A magnetic device adapted to be assembled with a square hole of a socket comprising: a base received in a connecting portion of the square hole; a magnetic element mounted to an end of the base, with the magnetic element magnetically attracting a bolt received in a driving hole of the socket disposed opposite to the square hole; and at least one expansive portion formed at an end of the base opposite to the magnetic element, with the expansive portion selectively hindering the connecting portion of the square hole of the socket, wherein the expansive portion includes an extending arm connecting an end of the base, with an end of the extending arm connecting with the base, with the other end of the extending arm connecting with the expansive portions, with the extending arm extending to the square hole toward a turning angle, wherein the magnetic device is received in the square hole of the socket without departing from the driving hole of the socket in an operating process.