This innovative holder is designed to safely hold a heat mat and eradicate the risk of hot spots and possible harm to your reptile. It also protects the heat mat from water or damage within the vivarium. Substrate can be placed over the top too, so that the holder is invisible. The mat should be stuck to the British Standard safety glass. The heat is distributed through the glass safely and more equally. You can rest assured, knowing that your pet is getting the heat he needs without any worry. The holder measures 11 x 11 inch meaning any mat of this size or smaller is a perfect fit for it. Ensures heating melamine vivariums has never been safer and more convenient. Specifically designed to enable heat mats to be used safely in wooden vivariums. Creates even heat distribution, eliminates hotspots, protects heat mat.