Includes: Titanium Spark Plug Boot Protectors (pack of 8)
Diameter of opening on ring side is 18mm (0.7")
Open side is 25.4mm(1")
Compare with the fibergrass spark plug boot protector ,It Looks great ,helps reduce misfires,Resists damaging chemicals, extends life of wire & boots. 25% stronger than fiberglass Boots
The products are designed to protect your Spark plug wire boots from the extreme heat generated by the headers or exhaust manifolds.Constructed with double layered,they create an effective non-flammable thermal barrier that will extend the life of your ignition wires.