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The correct answer among the choices given is option B. The length of the metal threads at the end of a spark plug is called the insulator. The insulator is the main part of a spark plug and is typically made from alumina. This is a very hard ceramic material with high dielectric strength.
Spark Plug Wires. Important, yet un-sexy. Thereâs not many technical articles about spark plug wires, and for years weâve been relegated to finding whatever information that was out there in the form of advertisements from manufacturers or on the back of the spark plug wire box.