Patent ID: 8544367

Claim:
A socket for a wrench, said socket comprising: a fixed portion provided with a first polygonal fastener receiving aperture that has a circumference that defines a plurality of first fastener engaging surfaces; a rotatable portion provided with a second polygonal fastener receiving aperture that has a circumference that defines a plurality of second fastener engaging surfaces; and a formation configured to releasably engage a drive formation of a drive device to receive a torque input from said drive device, wherein said fixed and rotatable portions are disposed such that said first and second polygonal fastener receiving apertures are in overlying relationship to define a fastener receiving space that has an axis of rotation and an open condition in which said first and second fastener engaging surfaces are substantially aligned in an axial direction of the fastener receiving space to provide a corresponding first number of fastener engaging faces, and wherein relative rotation of said fixed and rotatable portions in a circumferential direction of said first and second polygonal fastener receiving apertures moves said first and second fastener engaging surfaces out of said alignment to increase the number of fastener engaging faces to twice said first number.