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Wholesale Screw Clmap Type External Turning Tool for Turning and Milling. Secure Screw Structure: Screw structure prevents insert loosening, ensuring firm connection during operation. High Strength Material: Made of 42CrMo alloy steel with grade 12.9 hardness screw for superior rigidity. Precision Hardness Control: Advanced heat treatment ensures uniform hardness within HRC 43-47 range. Wide Compatibility: Compatible with CNC inserts with holes, suitable for CNC and engine lathes. High Precision Machining: Processed with high precision CNC machining centre for tight insert connection.