Purpose A secure steel plank interlocking internal ceiling system suitable for use in secure areas. Specification 1.5mm thick pressed steel planks. interlocking design supported by perimeter supports. Planks can be perforated or non-perforated. Standard plank widths 300mm, 450mm, 600mm. Standard plank lengths 2500mm and 3000mm. Planks cut to length on site. Planks can be insulated above after installation. Finish White polyester paint. Available Options Other polyester paint colours available.