High quality galvanised steel 100kg Capacity per level giving a total 500kg capacity per rack The unit can be increased to 1000kg by ordering the optional reinforcement bars AP29391 giving maximum 200kg per shelf see below No nuts & bolts means no tools required to assemble The five shelves can be positioned at various heights & can take hanging files without any modifications Units can be added to by ordering the extension bay kit AP2939E Display material not included