1. High Precision CAT SLN Side Lock End Mill Holder, apply to the holder of a DIN1835-B with a solid surface of the cutting tool, high speed and high precision machining . Mechanical spindle and cutting tools and other accessories . High Precision CAT shank Tool Holder ,balanced G6.3 or G2.5 For choose. 2. Prove cleanness , precision more stable ,surface more smooth,feel more comfortable and appearance nicer. Chuck surface is coated , the layer is evenly , Chemical plating solution dispersion degree of almost 100% , nickel layer is thin .This special coating can reduce Spindle abnormal wear and tear . Don't influence precision . 3. We can to figure to sample processing , and perfect after-sales service and technical support . Looking forward to your cooperation!