Found Metal Balls Under Your Kitchen Sink? Here’s What They Mean

If you’ve pulled everything out from under your kitchen sink and discovered small, dense metal balls (usually steel or lead-colored, about the size of a marble or cherry tomato), don’t panic—and don’t throw them away!

They’re almost certainly counterweights from your kitchen cabinet hinges, and they serve a very specific purpose.

 What Are They?
These metal balls are hinge counterweights, commonly used with full-overlay or soft-close cabinet doors—especially on larger, heavier doors like those for sink base cabinets, pantry doors, or appliance garages.

Brands like Blum (a leading European hardware manufacturer) use these in their “Blumotion” or “Tandem” hinge systems. The counterweight helps balance the door, ensuring it:

Closes smoothly and quietly
Doesn’t swing shut too fast (or too slow)
Stays aligned over time

 Reduces stress on the hinge mechanism

 How Do They Work?The metal ball is attached to a thin metal rod or arm that connects to the hinge. As the cabinet door opens and closes, the counterweight offsets the door’s weight, creating perfect balance—similar to how a window sash weight works.

If the ball has fallen off, it’s likely because:

The retaining clip wore out
The hinge was bumped during cleaning or plumbing work
The cabinet was recently reassembled (e.g., after a sink install)
 What Should You Do?
Don’t toss it! It’s not debris or a plumbing part.
Look at your cabinet hinges—you’ll likely see a small arm or socket where the ball attaches.
Reattach it if possible:
Many counterweights snap or screw back into place.
If the clip is broken, you may need a replacement hinge kit (available online—just match your brand/model).
If you can’t reattach it, the door will still work—but it may close unevenly or strain the hinge over time.
 Tip: Take a photo of your hinge before removing anything—hardware stores and online retailers can help match it.

 What It’s NOT
Not plumbing debris (pipes don’t use loose metal balls)
Not a pest deterrent (some people mistakenly place mothballs or steel wool—but those aren’t solid metal spheres)
Not a toy or random object—it’s precision hardware!
 The Bottom Line
Those metal balls are small but essential to your cabinet’s smooth operation. They’re a sign of thoughtful engineering, not a mystery or hazard.

So if you find one, celebrate your hinge’s sophistication—then pop it back where it belongs. Your cabinets (and your peace of mind) will thank you.