I've read that those cheap plastic hammers arn't heavy enough to break thicker auto glass. I have one of those S&W knives with the glass breaker, but I also have a D cell maglight secured under my seat and a Benchmade rescue hook secured on my visor.
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.