A nail drill from the brand Coslus. This brand—they mainly focus on affordable personal care and beauty gadgets.
It’s an electric manicure file, model BK-A08. I gotta say, the last time I bought something like this was 25 years ago… then once more, maybe 20 years ago. So yeah, these kinds of devices have been around for a while. But this particular one? It’s a modern take on that classic electric nail file.
Let’s check out what’s inside the box. Naturally, we’ve got:
The device itself
A user manual
A 2-year warranty card (you’ll need to activate that online)
Quick-start guide on the back
A USB charging cable
It uses a 400 mAh lithium battery, which might not sound like much, but it gives you around 2 hours of use on a full charge. And it charges up fully in about 1.5 hours.
What I really liked: it works while charging. Super handy if your battery dies mid-use—you don’t have to wait, just plug it in and finish what you were doing.
It also comes with a little cleaning brush for brushing off nail dust and a ton of attachments:
6 basic bits for beginners
5 ceramic bits for more experienced users
The ceramic bits are great because they stay cooler even at higher speeds.
On top of that, they included 25 replaceable sanding bands, which slip onto one of the attachments. That should last you quite a while.
Design-wise, the device reminds me a lot of a Dremel tool. But unlike a Dremel, the bits here just press-fit into the socket—no collet locking system or anything fancy. The shanks are round, with no extra grooves or grips.
It’s compact, not super lightweight but not heavy either. The build quality is solid—it’s made of aluminum alloy and feels really sturdy. In fact, I accidentally dropped it while filming this review. It rolled off the couch (thanks to its round shape) and hit the laminate floor. Neither the device nor the floor was damaged, so props for durability.
One thing that felt a bit off: there’s no hard storage case. Everything just comes in a simple grey drawstring pouch. Some older devices I have came with a nice case where every bit had its place. Here, the pouch is less elegant, but more compact. So—it depends what you value more: neat storage or saving space.
As for controls:
You power it on with a single button press.
It starts at 8,000 RPM.
You can adjust speed with plus and minus buttons, up to 20,000 RPM.
Double-tapping the power button reverses the rotation direction.
That reverse function is surprisingly useful—especially if you’re switching hands while doing your own manicure or working on someone else.
Only downside: the controls feel a bit laggy. There’s a short delay when changing speeds or switching direction—the motor stops, waits a moment, then restarts and ramps back up. It’s not a dealbreaker, just something to be aware of.
Bottom line? I really like this device.
It’s compact and solidly built
Charges via USB
Comes with a massive set of bits and sanding bands
Easy to use, and actually pretty effective