Product information "Insertion Pin MK2 with Extraction Nut"
Insert pins (also called taper mandrels) are used to hold drill chucks. An extraction nut is necessary if the Morse taper cannot be loosened by a hollow spindle using an ejector rod, or if there are no slots in the spindle through which the Morse taper can be ejected using a wedge on the ejector tab. This adapter is also suitable for accepting the Marlin driver heads.
Sizes of the morse taper:
large diameter in mm
smallest diameter in mm
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