The HP Boot by Heatshield Products is a spark plug boot heat shield for extreme heat situations. Made in the USA from top quality insulating materials, this spark plug boot heat shield can handle up to 1800 degrees of continuous heat and as much as 2400 degrees intermittently. This means your expensive spark plug wires will be safe and more importantly you won't have any plug wire failures due to heat leaving you stranded or dead on the track. This Heatshield Spark Plug Boot Heat Shield is for 45 degree angled spark plug boots. The part number is 420101 and the price is per boot.