A flat nut is provided with a threadlike retainer cord and structure for self-drilling and slotting a wall to provide a suitable hole for insertion of the nut, and a screw to be threaded into the nut. The retainer cord provides for positioning the nut on the back side of the wall. The nut has an elongated drilling point for making a hole and serrated teeth along an elongated side for making horizontal slots on each side of the hole to accommodate the full width of the nut. The arrangement provides a simple way to fasten objects onto a wall without access to both sides.