This is the Hirobo HI2521082 collar listed as "COLLAR 5 X 6.5 X 14" in the Hirobo helicopter parts range. It is a scale RC accessory intended to locate and retain parts on rotating shafts and internal linkages. The marked dimension "5 x 6.5 x 14" should be used to confirm fitment against your model.
The part works as a simple spacer and retention collar, helping keep bearings, gears, or other items in axial position during operation. Fitment depends on matching the label dimensions to the shaft or bore on your Hirobo helicopter or compatible general parts assemblies. Installation usually needs access to the shaft area and basic hand tools; refer to the model's assembly notes for torque and orientation guidance where applicable.
For routine service and tuning, this collar is handy when adjusting endplay or swapping out worn spacers. Because it is a general collar in Hirobo's parts list, verify the dimension set before ordering to ensure correct integration with your rotorhead or gearbox components.
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