- Helicoil thread repair kit: Suitable for engine repair and other automotive applications; restores damaged threads with a reliable thread repair tool. - Thread insert kit: Ideal for restoring damaged threads in steel, cast, iron, and aluminum; thread repair tool included. - Helicoil thread repair: Please check that the thread and pitch of the tap and the bolt match before use; thread repair tool included. - Full tool set includes: insert installations, wire thread inserts, drill bits, thread taps, lug breaking tools, thread repair tool, thread repair kit. - Use case: restore stripped spark plug holes or other damaged engine threads in engines, blocks, or cylinder heads. - Use case: repair damaged threads in steel, cast iron, or aluminum components such as engine blocks, heads, or housings. - Use case: fix worn or damaged threaded holes in transmission housings, exhaust manifolds, or other automotive assemblies.