The Mogen clamp is circumcision device used to hold and crush the foreskin after it is pulled past the glans.

The Mogen clamp was invented in 1954 by Rabbi Harry Bronstein, a Brooklyn mohel. For many years it was used only in Jewish ritual circumcision in a ceremony called a bris milah. In the past ten years or so, US physicians are using the clamp more frequently in medical settings for newborn circumcision.

The Mogen clamp will only open to 3.0 mm, reducing the chance of trapping the glans. It locks closed with great force along a narrow crush line. It does not cut, it only crushes. It is not a guillotine as is commonly thought. "Mogen" is Yiddish for "shield" - the Mogen clamp shields the glans from the scalpel.

Source: www.circumcisionquotes.com/rdr5.html

 Image Source: www.circlist.com/instrstechs/mogen.html