1OE Number: The chain saw ignition coil replacing part number is 544018301, 544018401, please double check the part number of your original ignition coil before purchasing. 2Applicable Models: The chain saw ignition coil is replacement for Husqvarna 55 K650 K700 K850 K950 K1200 K1250 ChainSaw with high efficiency and perfect fitness. 3Excellent Efficiency: The heavy duty chainsaw ignition coil can effectively improve combustion efficiency and strengthen electrical performance, providing better using experience. 4Quick Recovery: The chainsaw ignition coil can provide a higher intensity spark with faster recovery and response, providing you with more convenience. 5Easy to Install: The chain saw ignition coil is designed according to the original specification, you can directly replace the original one, greatly save your time.