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• Holds all ER16 collets
• Fits most tool holders, regardless of brand
• Made from alloy steel hardened to 54 - 56rc
• Precision ground ID thread and taper
• Has an internal thread of 22mm X 1.5 pitch
• Outside diameter is 1.1 inches (28mm)
• Outside hex for tightening is 25mm across flats
• ER16-Wrench works on this collet nut
  
• Internal cam removes collet when unscrewed
• Black oxide finish
• MariTool Part# is ER16-NUT