an attachment device fabricated from sheet metal and adapted to be driven into a wall includes a penetrating portion which is of a truncated - conical shape having at one end a wall - piercing open tip and at the other end a flat striking surface . a collar - forming portion integral with the penetrating portion extends out beyond the striking surface and has a neck portion and cutout openings to permit bending thereof around the object to be held and a tongue at the free end adapted to be secured to the penetrating portion to maintain the collar in tight holding contact with the object being held .