This is the Great Planes ElectriFly Collet Prop Adapter 3-5 mm.FEATURESAluminum construction, silver in colorMounts on electric motors with a 3mm shaft and adapts them to a 5mm diameter prop shaftINCLUDESOne 5mm Prop ShaftOne Aluminum Knurled Prop HubOne Aluminum Prop WasherSPECIFICATIONSLength: 1.10" (28mm)Shaft Diameter: 5mm
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