The circular item near the top, is some type of pipe cap. It is slightly flared at the closed end. Pipe threads inside. Too thin to be a driving cap for sand points. A large square nail. The other items were all found in one hole. Part of an iron buckle, and the assembly of several items, including leather strap section with iron nails in it. I had never found one this complete before. Might need to rent a jackhammer if the ground gets any harder.😅