Color: black + silver Material: Tungsten Carbide Coated,3 times than Carbide 6pcs 1mm 2mm 3mm 4mm 6mm 8mm diameter 4 Flute End Mill Cutter CNC Bits/set,Easier roughing and finishing processing U-shaped bottomgroove design, large front angle effectively reduces cutting resistance, and , convenient for chip removal, further improve machining efficiency End mill bits are suitable for side milling, end milling, finish machining Apply to Hardness of metal ,carbon steel, alloy steel, die steel, tool steel, cast iron, titanium, aluminum, etc Package Contents: 6 * End Mills Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.