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M4 Multi-Color Coated Spiral Fluted Tap for Processing Aluminum Alloy Machine Taps. Spiral Flute Design: Right-handed helical channel allows chips to flow forward, ideal for blind holes. High Hardness Material: Made of high-speed steel with cobalt, HRC65-67 hardness, ensuring toughness and break resistance. Enhanced Wear Resistance: Tin coating significantly improves hardness and wear resistance for sharp, durable performance. Secure Grip Chuck: Square chuck design provides a firmer grip during machining operations. OEM/ODM Support: Company offers OEM and ODM services with non-standard customization options. Professional Manufacturer: Dongguan Yutong Precision Cutting Tool with advanced equipment and professional technical team.