This is an unfinished, sanded select pine 6 or 8 blade hub for a propeller. These are intended to be used to make whirligig or other outdoor wind toys. Great project for the father and son or daughter. They have 1/4 inch grooves cut for your blades and a center hole that is threaded 6-32. Center hole can be used as a pilot hole to fit your drive shaft if needed. The hub measures about 3 1/2 inches in diameter and 3/4 inch thick. Please specify which hub you wish to purchase ( 6 or 8 blade ). 8 blade hub will be sent if not specified otherwise. Blades can be purchased separately on my other listing if desired. Shipping is free.