This Fan Blade Assembly is made for the 8' steel windmill. The 22" blades assembly has quality ball bearing which include grease fittings. These Fan Blade Assembly's are made for the 8" AE1 windmill and may not fit other brands of windmills. Blades are not returnable This assembly can be purchase either just the Fan Blade which doesn't include the Fin and Tall assembly. Or you can purchase the whole Fan Blade assembly which includes the fin and tail. Call for ordering information on the complete fan blade set or the just the tail fin call for ship out time. The shaft on this model is 1/2". Call for more information on any of our windmills. Made in the USA