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4-Flute Flat-Bottom End Mill and a Hardness of 65HRC. High Hardness Material: Made of tungsten carbide with hardness up to HRC65 for durability. Custom Size Options: Standard sizes 1-20mm available, with non-standard lengths customizable. OEM/ODM Support: Professional team provides customized solutions and OEM projects. Fast Response Service: After-sale team resolves inquiries and issues within 24 hours. Wide Material Application: Suitable for processing steel, cast iron, aluminum, and copper. Established Manufacturer: Founded in 2008 with 18+ years industry experience and 11 production lines.