A speculum is a medical device used to investigate the inside of a vagina. It holds the vaginal walls open using smooth edges and locks into place with the handle and with the wide hinges make for deeper viewing and are perfectly comfortable for long-term medical sex play. All you need to do to work this device is to turn the hand screw at the bottom until you reach the desired width. The speculum measures 6" from end to end, yet when the blades are spread fully open they measure 4.5" spread apart. The blades themselves measure 4.25" in length and are 1.5" wide.