Screw and driver system

摘要: A new Screw & Driver System for providing a way releasably securing driver to the head of screw such that cannot be lifted straight up and out screw. The inventive device includes therefore. has with an hourglass-shaped receiving cavity. cavity middle section pair opposed wedge-shaped sections extending from section. have undercut sidewalls. tool element having end wherein shoulder surfaces which cooperably engage lockingly mate sidewalls when are in working engagement.