A device for attaching or affixing one article to another, or for bundling and holding articles together. The device is formed by a filamentary member having a shielded pronged socket at one end and a head at the other end. The head is insertable into the socket and is proportioned to forestall accidental or deliberate distortion of the socket, and consequent release of the head, after it has been locked in position by the prongs of the socket. The prongs desirably include appendages to enhance ...