CHAMPION SPARK PLUG J17LM #845-1 Replaces RJ17LM B4LM CS4 1228 3410, SELECT: Type of Pack Condition: New This Champion spark plug works in many small engine brands and models. It can be used with chain saws, lawn mowers, pumps and trimmers. This plug utilizes a COPPER CORE AND RIDGES on the porcelain to run cooler and to lower the rate of corrosion of the plug to extend plug life. For use with walk-behind lawn mowers, chain saws, pumps, and trimmers Fits most engine brands and models Designed to withstand high temperatures 14 mm thread, 9-1/2 mm reach and 20-3/5 mm hex size Non-resistor plug For four cycle engines New OEM Spark Plug Card Blister Pack Champion J17LM #845-1 UPC 037551011117 Box Pack Champion J17LM #845 UPC 037551000258 Shop Pack Champion J17LM #845 Are wrapped in bubble wrap Set gap according to Operator's Manual for your engine 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.