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Aluminum Plug Wire Sheath is constructed from high-temperature rated glass fiber material bonded to a heat reflective aluminized material. Plug Wire Sheaths are an inexpensive alternative for protecting specific areas on both ignition wire and boot locations from damaging heat generating sources. Protection for electrical wires, hoses, cables & more Capable of withstanding 2000°F of radiant heat Inexpensive alternative for protecting ignition wires and boots 3/4 in. diameter x 6 in. long Sold in packs of 4