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Replacement Spark Plug for Champion J17LM, Bosch W9EC0 and NGK B4LM Spark plugs designed for chainsaw, brushcutter and lawn mower applications Terminal pin is made of a steel wire resistant to vibrations Locked terminal nuts to ensure efficient connection and resistance to vibration even in extreme conditions Ribs on insulator surface extend surface trajectory for eliminating any surface discharges, Weight: 0.11 pounds, Manufacturer: Oregon Tool