A clip for fastening accessories to vehicle panels includes a rectangular reinforcement case which is formed by the end contact of its opposite mid parts, by means of the fitted-together join of a single finger per side of each mid part, by means of a shape approximately of a double fold in the form of a zig-zag against the edge of the opposite part, which extends in parallel to the walls of the case and in the interior of the case. The remainder of this opposite part has a symmetrical finger with a similar arrangement.