The HeliCoil Professional Thread Repair Kit Part 5402-06 in size 6-40 is a high-quality tool designed for repairing and creating threads in a metric system. Specifically catered towards automotive use, this set includes a Heli-Coil insert from the reputable brand Helicoil. Although the kit does not come with a warranty, it is a reliable and durable option for those in need of precision threading for their vehicles. With its compact size and specific manufacturer part number, this kit is a valuable addition to any automotive tool collection.