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• Holds all ER20 collets
• This M style nut is the slimmer type
  
• Made from alloy steel hardened to 54 - 56rc
• Precision ground ID thread and taper
• Has an id thread of 24mm X 1.0 pitch
• Outside diameter is 1.102 inches (28mm)
• Outside has castle notches for tightening
• ER20M-Wrench works on this collet nut
  
• Internal cam removes collet when unscrewed
• MariTool Part# is ER20-MNUT