About maintenance: 1. Keep the knives clean, remove resin, sawdust, etc. from the wood after use, and use standard industrial solvents to clean the knives. 2. Apply a small amount of oil on the surface to prevent the surface from rusting. 3. Do not re-sharpen the tool and change the shape of the tool alone, otherwise it will easily cause the cutting edge to break and cause an accident. Notice: (1) the real cutting diameter is smaller than the marked diameter 0.05mm, it is specially designed like this, not caused by error or tolerance. (2) The tolerance is 0.005mm. Description: (1) Type: Single 2 Flute Spiral Solid Carbide End mills; (2) Grade: AAA; (3) Made of: High-quality Micro Grain Tungsten Steel Solid Carbide; (4) Shank Diameter: 3.175/4/5/6mm Best Suitable Materials: Acrylic, Compression, MDF, Aluminum could also suitable on below materials: (1) MDF, particle board, board with lagging, log, affixed to the skin panels; (2) Acrylic, PVC, resin, plastic, chipboard, composite board, melamine board; (3) Solid wood, native wood, plywood, lotus plate; Applied to: CNC Router Machining Center, Woodworking Machine, Advertising CNC Router, etc; Features: (1) Excellent combination of upper and lower blades, SHARP cutting edge; (2) High precision grinded and polished, high abrasion resistance and temperature resistance, good rigidity, not easy to break; (3) No burrs for Up and down spiral machining; (4) High performance, improve the work efficiency, reduce cost;