Nettleship Iris Repositer Dilator The 9mm size refers to

The 9mm size refers to the width of the blades

or other instruments

A Naunton Morgan Rectal Speculum Without Light Attachment Large (24mm) is a medical device used in surgical procedures to dilate the rectum in order to allow the physician to examine the rectal tissue

It is also used to collect tissue samples for biopsy

Nettleship Iris Repositer Dilator The 9mm size refers toThe Nettleship Iris Repositer is a surgical instrument used to hold the iris in place during cataract surgery. It is a small, curved metal instrument that is inserted into the eye and used to gently hold the iris in place while the surgeon performs the procedure.