Chrome vanadium, chrome-plated, polished. With crown spring as a retaining mechanism.
Krone spring - stainless and heat-resistant.
Krone spring - the greatest possible freedom of the insulator, preventing breakage of ceramic insulators and thus damaging the Kataysators.
Krone spring - damping of transverse movements.
6 spring elements hold the spark plug.
Avoid particularly smooth outer skin abrasion on the spark plug well. eg for BMW 12-cylinder engine M 70, 750i, 850i.
SW mm / inches: 16.0 / 5/8 "Length: 64.0 mm D1: 21.6mm d2: 22,0 mm t: 10.0 mm