a sheet metal structural member has flanged openings formed therein to permit the passage of services therethrough . a grommet is provided that has a shape that corresponds generally to the plan form shape of the openings . the grommet has a peripheal wall and seating elements arranged about the peripheral wall to mate with the flanges that are located about the flanged opening . the grommet snaps into place and resists movement once installed . the grommet has radiused edges to discourage damage to service conduits or wiring carried therethrough .