Ave!
A Set of Five Roman Keys, 1st-3rd Century, Sold!
All are copper alloy with original patina
Left to right; large rotary type for doors (possibly a janitor's key), two types for doors or large cabinets, another rotary key for a small locked box, and another plain key for a small box.
The key ring is not original but has rather been fabricated for display purposes and designed for you to add more keys as needed to your growing collection.