A water-proof grommet is provided which includes a plate-shaped head, a polygonal grommet body, and at least two latch pawls connected at lower ends to the grommet body and arranged on an outside surface of a substantially central portion of the grommet body. The head is substantially flat at a back...http://www.google.es/patents/US6560819?utm_source=gb-gplus-sharePatente US6560819 - Water-proof grommet
