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4 Flute High Precision Tungsten Carbide Long Neck End Mills with Air or Oil Cooling Mode In order to have a good cutting surface and extend the cutting tools life, a tool holder with high precision, high rigidity and good dynamic balance is required. 1. Measure the runout of the cutting tools before using, and if the runout is more than 0.01mm, please readjust it first. 2. The shorter of the length of the stick-out cutting tools is, the better the effect is. If the stick out