... match ceilings 3.rust resistence and durable 4.the manufacturer lightgate steel joist1.easy to match mineral ... ceiling board and aluminum ceiling board2.with galvanized, the joist is anti-corruption, fire proofing3.High Carrying capacity ... , Corrosion resistance, Rustproof,Fadeless5.Applications: widely used in the ceiling suspension system of office building, hotel, restaurant, supermarket, cinema, ...