Wrench

A wrench comprising:

• a wrench body having a first operating portion and a second operating portion, the first operating portion having an assembling aperture and a control aperture, the assembling aperture and the control aperture connected by an arcuate groove;
• a control member having a handle and a shaft rod, the shaft rod provided with a stepped through hole and disposed in the control aperture;
• a braking toothed member disposed in the arcuate groove, an end of the braking toothed member facing the assembling aperture comprising a toothed portion and another end facing the control aperture forming a convex groove, the convex groove connected to a link shaft via a connecting pin, the link shaft jacketed by an elastic member and together disposed in the through hole;
• and
• a ratchet wheel disposed in the assembling aperture of the first operating portion, an annular toothed portion disposed on a periphery of the ratchet wheel and engaging with the toothed portion of the braking toothed member, the ratchet wheel further comprising an operating hole.