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• Works on all HSK40E machines
• All critical tool holder surfaces precision ground
• Made from hardened alloy steel
• Tool Holder is Balanced to G2.5 at 40,000 rpms
• Gage length is 3.0 inches 
• Concentricity is less than .00015 Inches
• Collet nut is included
• Mini Collet Nut is slimmer than standard collet nut
• ER16 Mini Nut has an id thread of 19mm X 1.0 pitch. Outside diameter is .866 inches (22mm)
• Must use ER16M collet wrench
• Tool holder is coolant thru compatible
• Coolant tube not included but available here
• Coolant tube wrench not included but available here
• Threaded for stop screw type 1 (not included)
• MariTool Part# is HSK40E-ER16-3.0M