Great Planes Collet Cone Adapter 3.175mm Input to 5mm Output FEATURES: Aluminum construction, silver in color Mounts on electric motors with a 3.175mm shaft and adapts them to a 5mm diameter prop shaft Cone shap INCLUDES: One 5mm Prop Shaft One Aluminum Knurled Prop Hub One Aluminum Prop Washer One Aluminum Spinner Nut (5mm threaded) REQUIRES: Installation