1pcs ER Collet Chuck ER11 ER16 ER20 ER25 ER32 0.003mm for CNC Milling Tool Holder Engraving Machine Lathe Mill Spring Spindle BUY NOW $ 18.79 $ 27.231. The 7:24 taper accuracy of the tool holder is less than or equal to AT3, and some standard dimensions are completed in the last ...