Champion Spark Plug J6C #823 Replaces: RJ6C HO3 J5 J6 J9 J5J J6J J6JM J9J J10-COM-J J10-COM J64J J64J J87B J64G UJ6 UJ6M UJ6M The Champion Copper Plus core with Zirconia enhanced insulator spark plug features a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics. Copper core center electrode allows for accurate control of the plug's heat range, optimizing the plug's performance and adding to the longevity of the spark plug. The spark plug is designed to withstand high operating temperatures. Resists fouling and provides superior corrosion resistance. Champion Copper Plus Small Engine For use with chain saws and trimmers 14 mm thread, 0.375" reach Wrench hex: 13/16" hex Sparkplug seat: Gasket Card Blister Pack MPN: 823-1 UPC: 037551011070 Model: J6C Box Pack MPN: 823 UPC: 037551000029 Model: J6C 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.