Cusco's self-retaining bivalved speculum is a surgical instrument used for vaginal and cervical examination. It has a jaw that opens up like a duckbill. It comes in the model with centre screw. The advantage of Cusco's speculum is that it is self-retaining. Therefore, an assistant's help is not needed to keep the speculum in place. It also acts as the vaginal wall retractor. They come with a size variety: Large, Medium, Small, X Small, XX Small and XXX Small.