Product: Tungsten Carbide Internal Cooling End MillsMaterial: Tungsten CarbideType: Metric, Imperial, Non-standardProduct Description:Many tungsten carbide end mills are with internal cooling, the internal cooling design can reduce the heat of the end mill quickly.For some materials are bad thermal conductivity, so the heat can not be reduce when process the workpieces, high heat will cause the end mill broken easily.Internal cooling will reduce the heat, and keep the temperature below 600~700 degree, and the coolant can take the chips away, you will get good efficiency and surface finish.