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