Product Description: Attentions: The color of the item may vary slightly due to photography and your own computerSpecifications:Model : C20-ER16M-150LColor: Silver,BlackMaterial: 40 chromium (40CR)Accuracy: 0.01Hardness: HRC46-50Collet nut: ER16MShank length: 150mm/5.91 inchTotal Length: 185mm/7.28 inchShank OD: 20mm/0.79 inchShank ID: 14mm/0.55 inchCollet Nut OD: 22mm/0.87 inchCollet Nut ID: 12.5mm/0.49 inchOverall Size: 185 x 22mm/7.28 inch x 0.87 inch (L x OD)Weight:263gAttentions:To prevent the collet from locking, extension rod nut is eccentric designAdvantages:1.ER16M collet chuck,HRC46-50 hardness,0.01 accuracy. 2.C20 20mm diameter straight extended shank,applicable for deep processing.3.Extension rod diameter, and other parts have been precision ground to eliminate unbalance and increase stability during cutting4. The clamping nuts could be tighten straightly, high rigidity, strong clamping.5.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 6.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. The traditional ER chuck is easy to be locked in the cutter bar when it is installed, and cannot be removed. The eccentric nut is removed together with the chuck and cutter tool when the nut is removed. It nicely solves that problem. Installation Steps:1.Remove the nut and insert the collet eccentrically2. Insert the cutter3. Tighten the nut4. Pull out the cutter5. Eccentrically remove the collet Package included:1 x CNC Straight Shank Collet Chuck