Abstract: A screw extractor usable for an ordinary chisel is reversely rotatable and can be easily cut into the broken surface of said screw, and by turning it in reverse direction together with said broken screw and relevantly shaking said screw extractor during operation, said broken screw can be easily loosened and removed.

Abstract: The present invention discloses a safe reflective mirror with enlarged visual field, which comprises a case, two reflective mirrors and a fixing base. The case is installed to the other side of the driver within the vehicle by the fixing base. There is a viewing window pointing toward the front of the vehicle on the front end of the case and a display window, opposite to the viewing window, that is on the other side of the case and always pointing toward the driver. There are rotation axes located at positions extended from the viewing window and display window inside the case. The backs of the reflective mirrors are equipped with control rods, with which the two mirrors are mounted on the two rotation axes. The rods extend outside the case for adjusting the viewing angles of the mirrors to allow the drive obtain a wider visual field and thus driving safety.