These clamping bars hold small flat items, including name badges with pin backs, securely. By rotating the clamping bars they will hold 1 to 3 round objects at a time. This allows you to engrave multiple notary seals, coasters, paperweights, and a variety of other circular items. With a place for the “eye” of medallions, this clamp adapts to any vise or table that has a T-slot system.