Wrench adaptor allowing reversible operation

An adaptor for engaging with a box end of a wrench for use with a socket, the adaptor comprising:

• a housing including a first end and a second end adapted to engage with a socket, the first end of the housing including a compartment defined by a toothed inner periphery;
• a body including a first end adapted to be engaged in a box end of a wrench and a second end rotatably received in the compartment of the housing, the body including a transverse groove, a bottom wall defining the transverse groove including a cavity;
• a pawl pivotally mounted in the transverse groove and including a first toothed side and a second toothed side selectively engaged with the toothed inner periphery of the housing;
• a biasing means mounted in the cavity of the body for biasing the pawl toward the toothed inner periphery of the housing, thereby allowing one of the first toothed side and the second toothed side of the pawl to engage with the toothed inner periphery of the housing;
• and
• a switch member including a first end for manual operation and a second end engaged with the pawl, the switch member being pivotable between two positions corresponding to two opposite ratcheting directions to selectively urge an associated one of the first toothed side and the second toothed side of the pawl to engage with the toothed inner periphery of the housing.