I don't know this technical vocabulary but I will try: "Cut the angles of flat irons for a better prehension of.... " (teeth? pins?)

I saw it on a drawing of the product close to this: http://www.nisin.com.tw/pro-29-1.htm There is a photo for your reference. Please see picture 29-6. What I want to ask is a product like this with a metal plate instead of a wire. Thank you.

What is the context?