Invisible Window Grilles Singapore: Our range of invisible grilles meets your needs for style, function, and safety. Our Legate invisible grille products give you the same level of protection as regular grilles, but they don’t block your view. In high-rise apartments, condos, and offices, invisible grilles are often used. The Singaporean Elelaurels Brief Invisible Grille is made of 316 stainless steel with a PVC coating. This type of steel does not rust, so it does not need to be taken care of