Features [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. [High Carbon Steel] Made of high carbon steel for durability and long lasting performance, ensuring smoothly and precise boring operations. [Precise Accuracy] With an accuracy of ≤0.005mm, this boring head shank ensures precise and accurate milling operations, giving you excellent results. [Easy Installation] The shank is designed for easy and convenient installation, allowing you to quickly attach it to your milling machine for immediate use. [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. Specification:Item Type: Boring Head Shank Material: High Carbon Steel Thread: 1 1/2 18UNF Accuracy: ≤0.005mm Type: Milling Tool Package List:1 x Boring Head Shank1 x Storage Box Package List 1 x Boring Head Shank 1 x Storage Box