Is it permissible for a man to wear a black, unadorned bracelet designed for protection against kidnapping, which helps to break a car window and open handcuffs?

A bracelet that resembles women's adornment is not permissible for a man to wear, unless it is a means to prevent the harm of kidnapping and no other method exists. In such a case, it is permissible to use it out of necessity and only to the extent of that necessity.