This is the Great Planes ElectriFly Collet Prop Adapter 1.5mm-3mm.

Features

Aluminum construction, silver in color
Mounts on electric motors with a 1.5mm shaft and adapts them to a
3mm diameter prop shaft

Includes

One 3mm Prop Shaft
One Aluminum Knurled Prop Hub
One Aluminum Prop Washer

Requires

Installation

Specifications

Length: 0.83" (21mm)
Shaft Diameter: 3mm

Comments

For the version with a spinner nut order GPMQ4982.