ER11 Collet Set, 13PCS ER11 Collet Chuck CNC Spindle ER-11 Collet Lathe Tool Holder From 7MM for CNC Milling Lather 13Pcs ER11 Collet Set Gripping Range: 1MM to 7MM (1mm,1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,4.5mm,5mm,5.5mm,6mm,6.5mm,7mm) Run-out tolerance 0.01mm (0.0006") Made of high grade specially formulated spring steel, First class 1065 carbon steel For CNC milling Lathe Tool & Work holding Engraving machine. 100% service satisfaction, If you have any questions, please contact us, we will help you.