frame is made of steel,step is made of steel two step ladder open height(from top step to bottom):47CM close height(from top to bottom):90CM step size:(top step LengthX Width)31CM X 21CM (bottom step LengthX Width)31CM X 12CM distence between two step:26CM own weight with steel ladder:3.2kgs load capacity:150kgs step thickness:1.0mm tube thickness:1.0mm