... :green, yellow,blue,white,black,red 3.material YG8 Carbide Rotary Files/Tungsten Carbide Burrs is a new tape milling cutter with hign ... )with hardness up to HRC less then 70.Advantages:high productivity,good processing quality,high finish,can be used to process a variety ... wind-driven or electric tools ,we must clamping tool,and speed is allowed generally 6000-40000 r / min,2. Cutting should ...