Features: 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.ER straight rod type collet extension handle, spring steel collets with harden and precision,suitable for deep hole processing.4.Use for motor Rod Extension,can replace the drill clip,with ER collet perfect match for all kinds of straight shank tools.5.Extension rod is made of 40CR, with good quality.6.The spring collets is 1mm,1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,4.5mm,5mm,5.5mm,6mm,6.5mm,7mm.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:Color:Black and SilverBrand name: BQLZRWeight: 160 gMotor Shaft Extension Rod:Material:40CRSuitable Chuck: ER11Nut Type: Type ARod Hole Dia:8mmRod Diameter:16mmSize:40 x 19mm or 1.57 x 0.75Inch(L x Dia)Spring Steel Collets:Gripping Range:1.5MM to 7MM MODEL:ER11 Length: 18mmDiameter: 11.5mmPackage include:13x Milling Lathe Collet 1x ER11 Extension Rod Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.