1Set of ER20 collet 14pcs (1mm, 2mm, 3mm, 3.175mm, 4mm, 5mm, 6mm, 7mm,8mm,9mm,10mm,11mm,12mm,13mm ). ER20 spring collet Collet : ER20. 3KW Water-cooled Spindle motor Engraving Milling Grind. HY 3KW 220V Variable Frequency Drive VFD Inverter.
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