The ERA Door Viewer Polished Brass adds a useful security aspect to any door by enabling the user to see who is behind the door before opening it. It is perfect for retro-fitting standard door viewers, so there\'s no need to worry if you already have some fitted at the moment. The viewer gives you a 120° angle of vision. This viewer has a polished brass finish and the lens is made from glass. Other Variations The viewer is also available with a polished chrome finish - this can be found as a separate product in the related products.