Os Finder Set, The Original Os Finder Set /Flexible Dilator Set of 3 from Monarch Medical Products is ideal for nulliparous or post menopausal patients with cervical stenosis. Gently locates the external os and dilates the cervical canal for endometrial, intrauterine and hysteroscopic procedures. Available in a Reusable set of 3 and/or a Disposable Canal finder