DLC Coating :All end mill set with Diamond-Like Coating surface hardness:HV7000, Low coefficient of friction(μ=0.08-0.15)，Strong adhesion resistance Material:HRC62 ultrafine grain tungsten carbide, toughness and hardness and wear resistance Manufacturing:Five-axis high precision grinding machine, keep the carbide router bits Stable and controllable Quality Control:Each milling bit will be tested on the detecting instrument and laser a code. Precision: The Sharp Cutting edge with perfect circular shape will be ideal for precision machining of curved surfaces and 3D carving. Application:Excellent performance for machining types of wood and Aluminum, like: Cast Aluminum Alloys (HB 75 - 130), and Copper and copper alloys (bronze/brass) (HB 90 - 300). Hardwoods, softwoods, plastic, PVC and Acrylic. Diameter Tolerance:Tolerance of Ball Nose within -0.01mm. WEXWE Tools Extra Long Ball Nose Carbide End Mill, DLC Coating, CNC Cutting Tools For Aluminum and Wood Cutting, 3D Carving & Engraving. 2 Flute Router Bits，3/8 Shank (3/8-3" 2pcs）