Abstract: A holder and display unit for a socket of the type used in a socket wrench tool, including a fastening device for anchoring the socket to the display unit. The socket has a square recess for the male stud on the wrench drive component and the recess has a transverse detent hole in its sidewall of the type that cooperates with a detent ball or the like on the drive stud to retain the socket on the drive component. The fastening device has a head and a male plug portion that extends through an aperture in the display unit and into the square recess in the socket. A resilient arm on the male plug portion has a catch that registers with and snaps into the transverse detent hole. This releasably latches the fastening device, display unit and socket together.