The Spark Plug Thread Repair Tool Kit by DPTOOL includes a set of high-quality tools designed for repairing spark plug threads in metric measurements. With sizes ranging from 8mm to 18mm, this kit is ideal for restoring damaged threads and ensuring a proper fit for your spark plugs. The manufacturer part number DP500 indicates the specific design and quality you can expect from this product. Ideal for automotive maintenance and repair, this set is a valuable addition to any hand tool collection.