ER11 ER16 ER20 ER25 ER32 ER40 Collet Clamping Nut Chuck Holder and Spanner CNC Milling Lathe. Model: ER11 ER16 ER20 ER25 ER32 ER40. It is typically used in conjunction with a collet chuck, which is a type of chuck that uses a collet to hold the workpiece.
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