Functions: Carbon steel material ma high stability, is not easy to rust and ma long service life. High accuracy for fine mechanical process of good quality. The model is universal, does not choose a model. The tool set is made of high quality carbon steel with excellent hardness and impact strength to extend its service life. This product is a major accessory for CNC boring machines and milling machines, such as a coordinate boring machine, horizontal boring machine, and regular boring machine. It is used for inner hole surface treatment, boring, outer ring boring, face boring, ladder boring, face boring, cutting hole and outer ring groove, etc. Specification: Material: stal carbon Boring head: F1-12mm Tail thread: 1-1 / 2-18UNF Thread with mandrel MT-3: M12 List of packages: 1 x boring head F1 9 x boring blade 3 x Hex Wrench