Application:ER11 Spring ColletsBuilt 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.Brand newER straight rod type collet extension handle,the handle body is relatively long,suitable for deep hole processing.Can reduce the use of tools,reduce costs,improve efficiency.The outer diameter of the rod and other parts of the rod can be eliminated by precision grinding,which can eliminate the unbalanceand increase the stability of the cutting.colour:Black + silverMaterial:Carbon steelSize:1mm,1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,4.5mm,5mm,5.5mm,6mm,6.5mm,7mm,1/4 inch,1/8 inchShaft Hole:5mm (positive 0.02 mm) the need to install heating expansionER11A Nut:Outside hexagonal nut 19 mm maximum overall diametePackage Contents:15* collet1*ER11 chuckOnly 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.