The little button on a car seat belt might not seem like a big deal, but it actually plays an important role in keeping things convenient and safe.

Known as a stop button or retainer button, it’s that tiny plastic piece on the seat belt strap that stops the metal latch plate—the part you click into the buckle—from sliding too far down when you’re not using it.

Imagine if that button wasn’t there. The latch plate would just slide all the way down to the base of the seat belt, making it a pain to grab when you’re ready to buckle up.

Thanks to this simple button, the latch plate stays in an easy-to-reach spot, saving you time and frustration.

Where is the Stop Button Located?

Most seat belts actually have two of these buttons. One is near the latch plate to keep it from sliding down toward the floor, and the other is closer to the top, preventing the metal piece from slipping too far up toward the shoulder strap. Together, they make sure the seat belt stays in the right position for when you need it.

What Happens if Your Stop Button Breaks?

Over time, these buttons can wear out or even break off, but they’re easy to replace. You can find replacement buttons online or at auto stores, and they’re pretty simple to install with basic tools.

It’s one of those little things you don’t really think about until it’s gone. But once you realize how much hassle that button saves you—and how it helps keep the seat belt working as it should—you’ll definitely appreciate its small but mighty job