Don't know what this wrench was for on a continental engine. Don't know if it was used on car, army vehicle or airplane. Colyear was evidently a jobber for Continental parts in San Fransisco area. Don't know why they cast their own wrench with their co. name on it. Sizes are 1 3/16 and 1 5/16. Usable wrench not a advertising gimmick. 1/2 thick on ends.