this review title is: had i known and the content is: i would have just grabbed my rotary tool and had it do double duty but that is a guy talking here for most people a purposely designed nail tool like this that uses the same principles as a tool set rotary tool will provide great cleaning and smoothing to nail surfaces especially on the feet that said this is not something i would have purchased now knowing exactly what it does.there are other information for this review, one is this reviewer did not purchase it and the other is 0 people think this review is helpful.