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Slot.It GMF60 Lock Ring/Collar for Slot.It Modular Crown (Inline) Gears using a 6.0mm pinion. This is the part that keeps the motor shaft and washers included with the modular inline gears ("M Crowns") in place.
For more info about Slot.It's Modular Crown Gear System, see the document prepared by Slot.It (PDF format).