High Precision ER Collet Widely used in, milling, drilling, tapping, engraving, CNC, spindle machine and other clamping tool use.1.The milling cutter comes out of the water and cools deeply. Cartridge water stop and milling cutter internal cooling water stop can directly cool the milling cutter during machining to guarantee the accuracy and stability of the milling cutter. 2.-187℃ extra long deep cooling treatment. Deep cooling treatment changes the residual martensite to martensite. The analyzed nano-scale carbide particles increase the hardness and toughness. Reduces residual stress and enhances wear resistance.