Spark Plug Boot Sleeving Properties Heat Reflective Thermal Protection Sleeve Construction Braided Material of Construction Fiberglass Max Operating Temperature 1 200 Degrees F Inside Diameter 3/4 in Wall Thickness 0.09 in Color Black Length 7 1/2 in Closure Type No Closure For Use With Hoses Wires Description/Special Features Extreme Temperature Resistant Expandable Yes For Maximum Bundle Diameter 0.82 in For Minimum Bundle Diameter 0.63 in