Features Good Workmanship: This boring head shank is well made, with a neat and polished surface, good appearance and comfortable grip. Excellent High Carbon Steel Material: This boring head shank is made of excellent high carbon steel material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. Wide Application: This boring head shank has a wide range of applications and can be used for machining bore surfaces, boring end faces, cutting holes and more. Efficient Work: This boring head shank allows for quick and easy setup and tear down, saving you time when switching between applications. High Accuracy: This boring head shank allows for 0.005mm accuracy, with a 60 degree angle, and a thread of 1 1/2 18 UNF. 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 Shank 1 x Storage Box Package List 1 x Boring Head Shank 1 x Storage Box