KD Tools 3688 10mm Spark Plug Re-Thread Tool

KDT3688 Features: -Cleans and re-threads spark plug ports from the inside out.-Uses the good threads at the base of the port.-Reduces dirt and metal from being driven into the cylinder head.-Use light grease on the end to trap filings.-Size: 10mm This tool allows for chasing spark plug threads from inside the cylinder head and working outward.  Also reduces chance of debris from falling into the cylinder.  This not only makes the job easy, but it allows for a clean re-threading job!.-10mm Spark Plug Re-Thread Tool. Warranty: -Lifetime warranty does not cover abuse.