Great Planes Collet Cone Adapter 5.0mm Input to 5/16x24 Output FEATURES: Aluminum construction, Silver in color Mounts on electric motors with a 5mm shaft and adapts them to a 5/16-24 diameter prop shaft Cone shap INCLUDES: One 5mm Prop Shaft One Aluminum Knurled Prop Hub One Aluminum Prop Washer One Aluminum Spinner Nut (5/16-24 threaded) REQUIRES: Installation