Patent ID: 7618327

Claim:
A fastener system comprising: a fastener constructed with a head and a shank, said shank having a longitudinal axis, and said head constructed having a recess formed at its end, wherein said recess comprises: a central portion and a plurality of wings radiating outwardly from the central portion, each of the wings having an installation wall and a removal wall; a non-driving transition surface extending between each of the installation and removal walls of adjacent wings, at the radially inner most extent of said wings, each of said transition surfaces formed having an interference surface extending radially inward into the central portion, said surface being tapered from a first distance from the longitudinal axis at a top portion thereof to a second distance from said longitudinal axis at a bottom portion thereof, wherein said first distance is larger than said second distance; a driver constructed with driving surfaces shaped to engage the installation and removal walls of the recess, said driver having non-driving surfaces constructed in grooves between said driving surfaces; and further wherein said interference contours of said transition surfaces of said recess cooperate to form an interference fit with the non-driving surfaces in the grooves of the driver.