M-d aluminum sheet, union jack, 57141, 36″l x 24″w x 1/5″ thick, albras easy to cut, form and fabricate. Aluminum material will not rust or corrode. Perforated, decorative design is great for door and window security, plumbing, heating and ventilation projects, radiator heater enclosures, craft and hobby projects, room dividers, cabinet ventilation and more. Recommended for indoor or outdoor uses.