Abstract: An RFID tag supported on a carrier self locks to a work piece. The work piece, such as a beam, is modified to form an elongated slot in the beam having an opening along one face of the beam. A slip located is located in the elongated slot, the slip being bent on a fold following an axis generally parallel to the direction of elongation of the elongated slot and formed so that the slip retains a degree of spring force urging a pair of edges of the slip against interior major faces of the elongated slot. The slip is oriented in the elongated slot with the fold relatively away from the opening relative to the pair of edges so that at least one of the pair of edges catches on one of the interior major faces. The fold defines first and second sections of the slip on opposed sides of the fold, the first section forming a base section which carries a radio frequency identification tag and the second section forming a latch section, which is narrower than the base section.