The Helicoil 5521-5 is a 5/16th-18 coarse threading tool designed for automotive use. Manufactured by Helicoil, this specific model features a manufacturer part number of 55215. As a New Old Stock (NOS) item, it is likely a high-quality and reliable tool for hand threading tasks in automotive applications. The Helicoil brand is known for producing durable and innovative tools, making this product a valuable addition to any mechanic's workshop.
