It's easy to convince EDC people to buy EDC things. But how do you convince non-EDC folks to buy your product? Simple: Fear. The global "car escape tool market," according to market research firm Data Insights Market, is valued at $500 this year, projected to grow 7% a year and
The spark plug only works on tempered glass, on which these hammers also would also work great. The issue the article is pointing out is that many modern cars use laminated glass, not tempered, which is much harder brake, and on which the spark plug trick would porbably work even worse than one of these hammers.
Also, carrying around a tiny piece of a broken spark plug in your car, in manner where you can quickly and reliably access it in an emergency is probably difficult.
The spark plug only works on tempered glass, on which these hammers also would also work great. The issue the article is pointing out is that many modern cars use laminated glass, not tempered, which is much harder brake, and on which the spark plug trick would porbably work even worse than one of these hammers.
Also, carrying around a tiny piece of a broken spark plug in your car, in manner where you can quickly and reliably access it in an emergency is probably difficult.