These simply slide over the base of the spark plug wire end to help prevent it from melting, thus extending the life of your wires. As long as you order for the correct application there will be no risk of improper grounding.
Replaces
These simply slide over the base of the spark plug wire end to help prevent it from melting, thus extending the life of your wires. As long as you order for the correct application there will be no risk of improper grounding.