A wrench device having an adjustable head is provided, and the device comprises: a handle having opposing top and bottom ends, the top end having a protrusion, and the protrusion having a plurality of external slots; a wrench head having opposing top and bottom ends, the top end having at least one stationary wrench contact surface and at least one moveable wrench contact surface, and the bottom end of the wrench head comprising a U-shaped component designed to interact with the protrusion of the top end of the handle; a device for controlling the movement of the moveable wrench contact surface to determine a distance between the stationary wrench contact surface and the moveable wrench contact surface; and a device for engaging the slots of the protrusion to thereby allow movement of the wrench head and lock the head to a desired position.

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