ER11 1-7mm Collet Chuck height: . 18mm Outer diameter(Max): . 11.5mm Gripping 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 Rod Height: 38 mm(when the lock nut) Shaft Hole: 5 mm (+0.02 mm) the need to install heating expansion ER11A Nut: Outside hexagonal nut 19 mm maximum overall diamete Hardened and precision ground Built in -Release design and tools will never stuck in holder Widely used, boring, milling, drilling, silk attack, sculpture, , and other processing. Use with any standard ER collet chucks for coolant-thru tool applications. Each collet is packed in separate protective container with label. Colour: Silver Material: Carbon steel Note: The color of package is random, ' accept the specified color. Package Contents: 1 * Extension Rod 7 * ER11 Collets Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.