Features 1、GOOD PERFORMANCE: The milling tool holder has high thermal strength and oxygen resistance, as well as good comprehensive mechanical properties. 2、DURABLE MATERIAL: Using excellent 40CrMnTi material, surface quenching process, stable work and high hardness, no deformation after long term use. 3、STABLE OPERATION: Bilateral card key, double sided restraint design, it is not easy to swing left and right during heavy cutting, ensures processing rigidity. 4、STANDARD THREAD: The mill cutter tool holder has standard 7/16-20 thread, with high accuracy, easy installation and clamping and good work stability. 5、FOR MILLING TOOL: The mill arbor adapter is commonly used in milling machine brackets, suitable for various CNC milling processes situations. Specification Item Type: Milling Tool Holder Model: R8 FMB32 Material: 40CrMnTi Accuracy: 0.005mm Hardness: >HRC50°-55° Thread Size: 7/16-20 Package List 1 x Milling Tool Holder