English to Portuguese Tech/Engineering Safety Climbing devices - fall p

Hi, people,

Still on the climbing devices subject, I have come upon that expression:

"ultra quick arrest i- 70mm thanks to additional safety nose"

That safety nose is used in that quick arrest system and really has the appearance of a nose, connected to the karabiner. It looks like an outstanding button, but I really have no clue what name is used for that in Portuguese. I could post the picture.

Can you help me?