Tiger Teeth: The Devices that Inflict Severe Tire Damage
Yes, "Tiger Teeth" is the name of that thing that causes Severe Tire Damage. Here some lovely shots of Tiger Teeth from the manufacturer's catalog (Delta Scientific).
Not many people use Tiger Teeth any more...they just do too much damage. But there are still a few places that use them. One such place is the Hertz car rental agency at the San Francisco Airport. When we spoke with the manager there, he told us that he has no intention of removing them from his lots, because "they REALLY work".
And just for fun, here's a snippet from the 1998 movie "Urban Legend" that shows the usefulness of tiger teeth.