Hegar Uterine Dilator, single-ended, 18.5 cm (7 1/4") with a 4.5 mm diameter is a confirmed and standard reusable gynecological instrument. This variant has only one working end of a specified diameter. The smooth, slightly curved, and blunt tip is designed to minimize the risk of tissue trauma or perforation during insertion. The 4.5 mm size is one of a graduated set, used sequentially to enlarge the cervical canal, allowing the passage of other surgical instruments such as curettes.