You are buying  a  Vintage, new, never used center adapter for a metal prop spinner from many years ago.  THere is NO sign of paint damage on cone or tightening hole. Threads are 1/4" Fine thread. I am  thinning and selling vintage items. First picture shows what you will receive. See all pictures as they are part of the listing.    I will pack carefully and ship USPS. I can combine shipping. Thanks for looking.