These seem like they will work if we ever need to use them. I haven't needed to use it yet, Thank Goodness. But I have one if each of our cars just incase. I may or may not have gotten curious about how sharp the blade is and accidentally cut (and ruined... and threw away) the black thingy that holds the hammer... So... yea, it's sharp. I just plan to get really strong double sided tape and stick it somewhere central.
