Metal Open Trim Ring for 6 Inch Ceiling R30 PAR 30 Recessed Light Can - White METAL OPEN TRIM FOR 6 INCH CEILING LIGHT CAN - White Fits R30, PAR30 AND SAME SIZE COMPACT FLUORESCENT AND LED BULBS. 75W MAX INNER DIAMETER OF RING : 4 INCH OUTER DIAMETER OF RING : 8 INCH FITS IN 6" RECESSED CANS: HALO , ELCO , AND ALL SIMILAR BRANDS