This is the Great Planes ElectriFly Collet Prop Adapter 2.0mm-5mm.

Features

Aluminum construction, silver in color
Mounts on electric motors with a 2.0mm shaft and adapts them to a
5mm diameter prop shaft

Includes

One 5mm Prop Shaft
One Aluminum Knurled Prop Hub
One Aluminum Prop Washer

Requires

Installation

Specifications

Length: 1.10" (28mm)
Shaft Diameter: 5mm

Comments

For the version with a spinner nut order GPMQ4984.