High Temperature Spark Plug Wire Boot Protect Sleeve Cover for 4 CYL (Red) Withstands temperatures up to 1,200F continuous and 2,000F intermittent use No-fray cuff with a flexible dual-wall high-temperature basalt sleeving Works as a radiant heat barrier or can be placed directly on heat source Universal design fits most boots Length: 6", Thickness: 0.05", Inner diameter: 0.75"