Feature: 1. Strong Hardness: Made of molybdenum steel, with high hardness, will not easy to deform even if it is used for a long time, which is firm, sturdy, accurate and stable. 2. Exquisite Workmanship: Hardening and quenching with exquisite workmanship, screw locking, large chip removal space, with good chip removal effect. 3. Comfortable to Use: Double side clip key for double side restraint, which is not easy to shake left and right during heavy cutting to ensure the rigidity of processing and comfort. 4. High Performance: With high heat strength, oxygen resistance, good comprehensive mechanical properties, fully carburized and heat treated, with strong wear resistance, highly stable and firm. 5. Simple to Use: The arbor adapter holder is easy to change, set and low maintenance, the blade can be used to process a variety of materials. Specification: Item Type: R8 Shank Shell Mill Arbor Adapter Material: Molybdenum Steel Overall Clamping Runout: 0.01-0.05 Specification: 7/16-20 Roundness: 0.8MM Surface Roughness: >0.8MM Hardness: >HRC50°-55° Standard Speed: Below 10000RPM. Package List: 1 x R8 Shank Shell Mill Arbor Adapter