This device is used to enlarge rings and wedding rings of diameter 12,4mm to 22,4mm. Enlarging starts from placing a ring on the cone-shaped mandrel and mounting a roller with a profile matching the wedding's profile on the punch of the lever. The ring is enlarged by pressing down the roller and simultaneously turning the punch. Set includes:

- 3 cone-shaped punches,

- 8 rollers with 13 profiles, one plain roller and a stand for mandrels and rollers.