Bosch 0242050510 / USR4AC Nickel Spark Plug Petrol Ignition Part Equipped 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 & large copper core: For a smoother engine operation & a steady acceleration Nickel-plated housing & thread: For protection against corrosion & seizure in the aluminum cylinder head without the need for lubrication Factory pre-set electrode gap: Enables hassle-free replacement of spark plugs Item Specifics: Electrode Material: Nickel Short Code: USR4ACGap: 0.5 mm Thread: M10 Thread Length: 12.7 mm Hex Size: 16 mm Number of Electrodes: 1OE Numbers: 0000 400 7013, 0000 400 7013A, 0000 400 7013B