Feature: 1. The tool holder is closely matched with the cutter head, no gap is suitable for plane milling processing. 2. The cutter head can be fixed by only a central screw and bilateral keyway. Each shank is equipped with a screw and a baffle plate to assemble the face milling cutter head. 3. The female thread is finely turned after fire, with high tensile strength, and the central through hole is favorable for water outflow and strong shock resistance. 4. The handle has high thermal strength and oxygen resistance, as well as good comprehensive mechanical properties. 5. The handle is heat treated as a whole, and after fine grinding, the surface treatment is carried out to prevent surface corrosion and rust. 6. Cone shank grinder is for fine grinding, in contact with standard ring gauges, with an area is greater than 85%. Specification: Item Type: NT40 Milling Tool Holder Model: NT40-FMB22-45 Material: 42CrMo Purpose: Used to connect the cutter head Product Hardness: HRC43-48 Cutter Diameter: Approx. 48mm / 1.9in, 63mm / 2.5in Tail Thread: M16 x 2.0 The Total Length of the Product (Without Screws): Approx. 155mm / 6.1in Taper Shank Type: NT40. Package List: 1 x NT40 Milling Tool Holder