The Thread I.D. Large Imperial Thread Identifier Kit by Chestnut Tools is a comprehensive set of hand tools designed to accurately identify metric threads in the range of 12M to 6M. This kit includes a Nut Bolt Thread Checker to ensure precise measurement and identification of threads, this set is reliable and durable for automotive use. Made by Chestnut Tools in China, this kit is essential for anyone needing to work with threads in a professional setting.