Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: Product 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,2mm,3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm.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 & SilverBrand name: BQLZRWeight:299 gMotor Shaft Extension Rod:Product material:40CRSuitable Chuck: ER16Nut Type: Type ARod Hole Dia:5mmRod Diameter:20mmSize:41.2x25mm/1.62x0.98inch(L x Dia)Spring Steel Collets:Product material:SteelModel: ER16(10pcs,1mm-10mm)Length: 27.5mmDiameter: 17mmPackage include:10x Milling Lathe Collet;1x ER16 Extension Rod Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.