Hoffman F66WPFG F25 Closure Plate, For Use With 6 x 6 in NEMA 12/3R Fiberglass Wireway and Trough, Steel

10 gauge 316 stainless steel, used to seal the end of a wireway section or run. 6.00 x 6.00 in. (152 x 152 mm) can be used for transition to 4.00 x 4.00-in. (102 x 102-mm) size.