Torque enhancing wrench

A wrench for driving a headed fastener and comprising:

• an elongated handle including a first end having a head provided thereon, said head including a closed peripheral wall bounding an orifice for receiving a head of a fastener to be driven by said head,
• said head including at least a first cusp and a second cusp extended inwardly into said orifice, said head further including a first surface formed beside said first cusp and a second surface formed beside said second cusp for engaging with the head of the fastener, and
• said first cusp and said second surface being located so as to engage the head and drive the fastener in a first direction, and said second cusp and said first surface being located so as to engage the head and drive the fastener in a second direction opposite to the first wherein the orifice is sized so as to enable the first and second cusps and the first and second surfaces to be disengaged from the head of the fastener, thereby enabling relative rotation between the wrench and the head without removing the head from the orifice, wherein said head further includes a third cusp and a fourth cusp extending inwardly into said orifice and located between said first and said second cusps, said third cusp being defined by third and fourth surfaces, said fourth cusp being defined by fifth and sixth surfaces, such that said first cusp, said second surface, said third surface and said fifth surface are located so as to engage the head and drive the fastener in said first direction, and said second cusp, said first surface, said fourth surface and said sixth surface are located so as to engage the head and drive the fastener in said second direction.