This is the Great Planes ElectriFly Collet Cone Adapter 1.5mm-3mm.
FEATURES: Aluminum construction, silver in color Mounts on electric motors with a 3mm shaft and adapts them to a 3mm diameter prop shaft Cone shaped spinner nut adds good looks
INCLUDES: One 3mm Prop Shaft One Aluminum Knurled Prop Hub One Aluminum Prop Washer One Aluminum Spinner Nut (3mm threaded)
REQUIRES: Installation
SPECS: Length: 1.20" (30.5mm) as assembled Length: 0.83" (21.3mm) shaft only Length: .71" (18mm) spinner nut only Shaft Diameter: 3mm Spinner Nut Diameter: .31" (8mm) at the widest point