I carry a Spyderco Assist a lot. It's good for more than just rescue, but it's excellent for that. It has the glass breaker in the butt, the finger grooves give it a positive grip under any conditions, the combination of large opening hole and cobra hood make it the surest opener, even with heavy gloves.
Has anyone actually used the glass breaker on the Assist to break a car window and if so is it effective?
Thanks.