Why take chances with a spark plug boot failure in the heat of competition? Use the ultimate spark plug boot heat shield and protect your motor and expensive plug wire sets! Featuring a 304 stainless steel and ceramic insulator construction, our HP Boots stop heat in its tracks. Put these on your race car today and forget about boot failure replacing your plug boots from heat damage again. Capable of withstanding 1800-degrees Fahrenheit continuous these heat shield boots can handle all your extreme heat protection needs. Our spark plug boot heat shields come in three different configurations: straight, 135-degrees and 90-degrees .