https://www.amazon.com/s?k=rescue+hammer https://www.amazon.com/s?k=rescue+hammer A quality rolling ballpoint pen would also work (given enough force) because

https://www.amazon.com/s?k=rescue+hammer https://www.amazon.com/s?k=rescue+hammer A quality rolling ballpoint pen would also work (given enough force) because it contains a small ball of tungsten carbide. My knife also has a tungsten carbide window breaker on the base of it.