Champion Spark Plug CJ6 #849C 849 Replaces: RCJ6Y 018-3011-6 Keep the engines in your outdoor power equipment operating with the Champion Spark Plug for Mowers, Chain Saws, Pumps and Trimmers. The spark plug comes equipped with a resistor and has a 14mm thread. For use with chain saws, lawn mowers, pumps and trimmers Works with most small-engine brands and models 14 mm thread, 9-1/2 mm reach and 13/16 mm hex size UPC: 037551011339 Model: CJ6 #849C 849 Shop Pack plugs are from a Bulk Shop Pack and are shipped wrapped in individual bubble wrap units. Purchase is for one one spark plug USA domestic shipments are shipped USPS Ground Advantage Mail with Tracking When buying different variations from the same or similar listings, the lowest shipping cost is obtained by buying the total number of units wanted from 'One Variation' and then leaving a message within your order defining what items you want to receive and the number of each item you want to receive. The number of items requested cannot exceed the number shown as being in stock. This stops from restarting the total weight summation for each variation. The message link is on the same page where you select method of payment.USPS postage cost is based on total weight and zip code. The cost breakdown is shown before payment is required and the discount for multiple purchases is shown as a separte credit in the list.