Have any idea what these are?

Can you help us identify these tools? Because they are vaguely catheter-shaped, my best guess is a urethral dilator or sound, but I have not been able to confirm this.  Each probe is threaded as if they attach to a handle. They are each about six inches long, and there is no opening in the end. Please comment if you have a clue what these are used for!

(UT Health Science Center Historical and Special Collections has initiated a project to identify items in a collection of medical artifacts.  If you have further information about the items highlighted, please comment.)