What this is Pack of 4.7 mm M42 cobalt speed steel drill bits (1 pack). Each bit is 80 mm (3.15') overall length with a 40 mm (1.57') flute length and a 135° splitpoint angle for reduced walking and more accurate starts. Key benefits — why you need them Accurate starts and cleaner holes: 135° splitpoint minimizes walking and centers the bit quickly for precise drilling in metal, wood, and plastic. Long life and heat resistance: M42 HSS with 8% cobalt offers hardness, wear and heat resistance, and crack resistance for demanding jobs. Improved surface durability: titanium nitride (TiN) coating increases wear and corrosion resistance, extending tool life and reducing replacement cost. Costeffective in production: 3–5× longer life compared to standard HSS bits lowers cost per hole and supports volume or automated machining. Performance and compatibility Designed to cut hard and difficulttomachine metals as well as hardwoods, composite boards, plastics, and thin wood sheets. Cutting edges retain sharpness at RPMs, suitable for both manual drilling and CNC/automated equipment. Typical applications (practical scenarios) 1. Metal fabrication: drilling holes in strength steel components where heat and wear resistance are required. 2. Woodworking and furniture making: precision mortiseandtenon joinery, detailed carving, and drilling dense woods such as rosewood and teak. 3. DIY and composite work: clean, accurate holes in composite boards and plastics for assembly or prototyping. Technical specifications Quantity: 1 pack Diameter: 4.7 mm Overall length: 80 mm (3.15') Flute length: 40 mm (1.57') Point angle: 135° splitpoint Material: M42 cobalt speed steel (8% cobalt) Coating: Titanium nitride (TiN) These bits deliver durable, precise drilling across metal, wood, and plastic applications, making them suitable for professional workshops, production environments, and serious DIY projects.