Review (2/5): Works well, but very fragile: I snapped it in half within a week
Snapped in half within a week: after running it under water in the sink, I grabbed it with a towel with one hand, planning on pulling it out of the towel with the other hand to dry it, but to my surprise it snapped in two when I gripped it through the towel. I've had other 'glass nail files' in the past, typically acquired from booths at town fairs, and they seem extremely durable when compared to this product. Maybe the one I received had a defect compromising the structural integrity, but I have no way of knowing for sure.