ER11 Collets: Brand newMaterial: steelColor: silver+black Total height: approx. 18mmOuter diameter (max): approx. 11.5mmGripping range: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mmBuilt in self-Release design and tools will never get stuck in holder.Use with any standard ER collet chucks for coolant-thru tool applications.Each collet is well packed in separate protective container with label.Hardened and precision ground.Performance stability, high accuracy.Durable in use.Widely used, boring, milling, drilling, silk attack, sculpture, CNC, and other processing.ER11A 5mm Extension Rod: Brand newHeight: approx. 40mm (when the lock nut)Shaft Hole: 5mm (-0.02 mm) the need to install heating expansionER11A Nut: Outside hexagonal nut 19 mm maximum overall diameteHigh strength and hardness.Package included: 1 x ER11A 5mm Extension Rod7 x 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.