Those are not Singer 222 attachments although they are for a Singer machine. The tip off that they are not the
original attachments that were issued with the machine are the bobbins. They are not featherweight bobbins and I don't believe that featherweight attachments came in a case like the one in the picture. It's probably from an older Singer. 222's were only made for a couple of years, 1954 and 1955 and these attachments appear older. After 1955, the company found 222's too expensive to manufacture to receive good profit returns. Those attachments would fit but aren't exactly what was sold with the 221. If you check the 221 manual, you will see what was originally issued with the machine.