For use with the Automatrix® Retainerless Matrix system. In situations where a circumferential matrix is required, the Automatrix® Retainerless Matrix System provides a marginal seal and a form for placement of restorative material without the need for a bulky retainer. Its design is ideal for larger preparations and buccal or lingual extensions. Automate® III tightening device limits over-tensioning, and provides easier shaping of contact