Our new Spark Plug Thread chaser will remove galling and buildup from both the spark plugs and the lead coupler threads to ensure optimum electrical connectivity. Just run the thread chaser over the spark plug threads to clean it, then flip it over and run it into the lead connector to clean that as well. It’s a simple and effective way to restore your threads to like new condition. This kit contains both thread chasers to do both 5/8-24 and 3/4-20 1 lbs (0.5Kg) shipping weight.