Patent ID: 8701524

Claim:
A complex wrench comprising: a strip-shaped shank having a front section, a middle section and a rear section; the ends of the front section and the rear section connecting a first driving head and a second driving head respectively; the middle section being a twisted section which makes the axes of the first driving head and the second driving head on different planes, the rear section including a horizontal section and an arc section within the rear section, a perpendicular plane of the axis of the second driving head and a tangent plane of the horizontal section forming an included angle, the included angle being between 15 degrees and 90 degrees, the surface of the shank being provided with at least one sunken area wherein intensive plurality of knurls is implemented therein, the sunken area being on the surface of the twisted section, and the two ends of the sunken area extending to the surfaces of the front section and the rear section.