A female acquaintence of mine suggested that men need to pay more attention to their nails, hence this post which may be the first one that's made me a bit uncomfortable writing it.
I mean, I agree that nails should be given their due every week or two so as to keep the whites of the nails between one and two millimeters in length but men don't talk about these things. So just clip to shorten and then file to smooth. Cuticles carefully trimmed. And complete the treatment with a moisturizing hand cream that is never purchased in person lest one be mistaken for an oenophile or something and forced to seek asylum in another country.
You see, it used to be that a man got his nails trimmed twice a month while he had his hair cut. No more. That was before the advent of hair stylists, unisex hair salons, and the relocation of the manicurists into stand-alone stores staffed by ladies from southeast Asia. So now, a manicure requires a separate trip to some exotic spa aimed at metrosexuals. It's safer to attempt it at home.
Nail maintenance requires manicure scissors, clippers, a file, a brush, and the aforementioned hand cream. This basic equipment can be purchased separately, or in a manicure set like the The Art of Shaving's offering in the photo that someone who doesn't know you very well gives you as a gift. Some men also buy nail buffers to add a shine to their nails, but you shouldn't.