ITEM NAME:ER11 5mm Motor Shaft Spindle Extension Rod Holder Collet Chuck CNC Milling Tool Steel ER11 5mm Motor Shaft Spindle Extension Rod Holder Collet Chuck CNC Milling Tool SPECIFICATIONS.(1) This collet is made of high quality steel for milling lathe tool and work-holding engraving machine. Item included: 1 x Motor Shaft Collet. Suitable for: boring, milling, drilling, tapping, grinding and other processing.