Assures continued operation of this vital security link. Here is an excellent way to protect your emergency lights against both vandalism and accidental damage. It's easy to install with all screws and anchors provided. Backed by a lifetime guarantee. Constructed of tough, 9-gauge steel wire that is coated with corrosion resistant polyester. It is not surprising that it is backed by a lifetime guarantee against breakage in normal use. This Stopper is highly recommended for areas where abuse is severe or it is imperative that emergency lights continue to operate.