The HELI-COIL 1/4" 20 Thread 1/4-20 Prewinder Insertion Tool with Metal Sleeve 7551-4 is a high-quality automotive tool designed for hand threading tasks. This single item set is manufactured by Helicoil in the United States, known for its durable and precise products. The tool is specifically designed for 1/4" 20 SAE threads, making it a reliable choice for professionals and automotive enthusiasts needing to accurately create or repair threads with this size. Its compact design and metal sleeve make it a practical and long-lasting addition to any toolbox.