Patent ID: 8561504

Claim:
A wrench socket comprising: a main body portion having a through hole and a side opening to said through hole; two arms separately connected to said main body portion and provided with respective formations engageable with a drive applying device; wherein said arms are movable relative to said main body portion between an open position in which respective free ends thereof are spaced apart to open said side opening to said through hole and a closed position in which said arms close said side opening; wherein a sidewall of said through hole defines at least three sides of a polygonal fastener receiving aperture, and wherein said arms when in said closed position define at least one side of said polygonal fastener receiving aperture; wherein the arms are arranged such that when in said closed position said formations are positioned to cooperably engage a said drive applying device such that the drive applying device locks the arms in said closed position and can apply a torque to the wrench socket; wherein said fastener receiving aperture has a centre, a first axis disposed in a plane and extending through said formations and said centre and a second axis disposed in said plane, said second axis extending through said centre and said main body portion and perpendicular to said first axis; and wherein respective locations at which said arms are connected to said main body portion and said formations when said arms are in said closed position are all disposed to one side of said second axis.