BUD Industries NBX-32932 Steel Internal Panel, 18-7/32" Length x 14-1/4" Width x 3/64" Thick, Natural, for NBF Series Boxes Designed to fit NBF series enclosures Fits enclosure: NBF-32032, NBF-32132, NBF-32232, NBF-32332, NBF-32432, NBF-32034, NBF-32134, NBF-32234, NBF-32334, NBF-32434 16 GA galvanized steel construction Assembles to mounting bosses inside the enclosure Measures 18-7/32" length by 14-1/4" width by 3/64" thick