This is the Great Planes ElectriFly Collet Cone Adapter 8mm-3/8-24. FEATURES: Aluminum construction, Silver in color Mounts on electric motors with a 8mm shaft and adapts them to a 3/8-24 diameter prop shaft Cone shaped spinner nut adds good looks INCLUDES: One 8mm Prop Shaft One Aluminum Knurled Prop Hub One Aluminum Prop Washer One Aluminum Spinner Nut (3/8-24 threaded) REQUIRES: Installation SPECS: Length: 2.13" (54.3mm) as assembled Length: 1.87" (47.4mm) shaft only Length: 1.25" (31.9mm) spinner nut only Shaft Diameter: 3/8-24 Spinner Nut Diameter: .79" (20mm) at the widest point COMMENTS: For the version without a spinner nut order GPMQ4971. jxs 02/21/07 ir/jxs