ER11 1-7mm Collet ChuckTotal height: . 18mmOuter diameter(Max): . 11.5mmGripping range: 1MM to 7MM (1mm,2mm,3mm,4mm,5mm,6mm,7mm)Fits metric size(s): For example,1mm Collets Fits 1mm metric ,2mm Collets Fits 2mm metric .ER11A 5mm Extension RodHeight: 38 mm(when the lock nut)Shaft Hole: 5 mm (+0.02 mm) the need to install heating expansionER11A Nut: Outside hexagonal nut 19 mm maximum overall diameteHardened and precision groundBuilt in self-Release design and tools will never get stuck in holderWidely used, boring, milling, drilling, silk attack, sculpture, CNC, and other processing.Use with any standard ER collet chucks for coolant-thru tool applications.Each collet is well packed in separate protective container with label.Colour: SilverMaterial: Carbon steelNote: The color of package is random, don't accept the specified color.Package Contents:1 * Extension Rod7 * ER11 ColletsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.