Instantly add heat protection to your wires with Their thermal insulating wire jacket. The heavy duty construction features aluminized cloth on the outside with a heavy duty glass insulator in the middle. The heat shield wire jacket is 12 inches long and has an adjustable inside up to 2 ½ inch diameters. Installation is easy thanks to the hook and loop fasteners. It is capable of withstanding 1100F of continuous radiant heat and 500F of direct contact.