Clarke CHT261 Spark Plug Thread Chaser

Covering the two most common sizes, this reamer, driven by a spark plug socket, will clean & restore threads in the engine block that may have been damaged due to careless spark plug insertion or removal.For use on 14mm & 18mm spark plug holes.Ideal for cleaning carbon and corrosion clogged threads.Can cure cross threads and minor damage saving expensive thread inserts.Driven by a spark plug socket.