6 METAL DOOR SYSTEMS AND COMPONENTS THEREOF, NAMELY, METAL SKIN DOORS, METAL DOOR HANDLESETS, METAL DOOR LOCKSETS, METAL DOOR LOCKS AND DEADBOLTS, METAL DOOR COMBINATION CLOSURE AND KEYS, METAL WEATHER-STRIPPING FOR METAL DOORS, WOODEN DOOR FRAMES, NON-METAL DOOR FRAMES, NONMETAL DOOR SILLS, COMPRESSIBLE NONMETAL WEATHER-STRIPPING, AND DOOR LIGHTS, SIDE LIGHTS AND TRANSOM LIGHTS, NAMELY WINDOW PANES FOR METAL DOOR AND METAL DOOR FRAME OPENINGS ALL SOLD AS A UNIT