Emergency Fire Starter, Zippo Outdoor Line
Swedish fire steel by Light My Fire $7.95. Totally going in my emergency/disaster kit!
Hankshaw says: I keep 4 of these in the front pocket of my EDC. Don't get locked in a stairwell during an emergency. The fire department throws these over a hinge on an open steel security door. It prevents them from getting locked in by a closing door. Good enough for them is good enough for me.