Product Description: Advantages: 1.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 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.The nuts could be tighten straightly, high rigidity, strong clamping.4.It suitable for extension of the Tool holder CNC Mill, Special quality steel,high hardness.5.With the use of ER chuck can be perfectly matched with all kinds of straight handle tool6. Extension rod diameter, and other parts have been precision ground to eliminate unbalance and increase stability during cutting. 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 colletSpecifications:Material:40 chrome steelColor:Silver+BlackShaft hole: 6mmSize:39.6 x 19mm/1.56 x 0.75 inch(L x Dia)Weight:100g Package include:1 x ER11 Extension Rod