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Bosch 0242050510 / USR4AC Nickel Spark Plug Petrol Ignition PartEquipped with a ground electrode made from nickel alloy: Bosch Nickel spark plugs are developed to the same high quality as original equipment for a wide range of applications. High heat conductivity with ground electrode made from nickel alloy and large copper core: For a smoother engine operation and a steady acceleration Nickel-plated housing and thread: For protection against corrosion and seizure in the aluminum cylinder head without the need for lubrication Factory pre-set electrode gap: Enables hassle-free replacement of spark plugsItem Specifics:Electrode Material : NickelShort Code : USR4ACGap : 0.5 mmThread : M10Thread Length : 12.7 mmHex Size : 16 mmNumber of Electrodes : 1OE Numbers : 0000 400 7013 , 0000 400 7013A , 0000 400 7013B