NGK spark plug with M18 thread for Mercedes 170 pre-war and many other pre-war vehicles
18mm thread / thread length 12mm / wrench size 21mm
Comparable to Bosch M10AC, M95T1; Replacement for KLG M30
Group 15, Electrical Equipment on the Engine
Niem.Compar.Nr .: C15362d
NGK AB-6, 2910