A rare set of Aussandon’sUterine Dilators that employs a screw-thread configuration to facilitate introduction of the device into the cervical os.  Included are five graduated dilator tips that are secured by a threaded locking mechanism to the introducer. The outfit is contained in a fitted leather case (31 x 6 x 3.4 cm) with linear tooling on the lid which is lined with red silk and velvet.