1、[1 1/2 18UNF Thread] The boring head shank features a 1 1/2 18UNF thread, providing a secure and stable connection for your boring head. 2、[High Carbon Steel] Made of high carbon steel for durability and long lasting performance, ensuring smoothly and precise boring operations. 3、[Precise Accuracy] With an accuracy of ≤0.005mm, this boring head shank ensures precise and accurate milling operations, giving you excellent results. 4、[Easy Installation] The shank is designed for easy and convenient installation, allowing you to quickly attach it to your milling machine for immediate use. 5、[Versatile Use] This boring tool shank is suitable for various milling tools, widely used for machining inner hole surfaces, boring end faces, cutting holes, etc.