Glardon-Vallorbe スイス製 半丸スリム精密ヤスリ - LP1566

You cannot find another file brand that matches the superb quality and craftsmanship of these guys. Maybe you could 50 years ago, but not today. Sadly, most American and Swiss file companies that once were a pinnacle of steel workmanship the world over, no longer exist or have offshored their manufacturing process to locations lacking the means, tooling or knowledge needed to craft such files. There’s only a tiny handful of companies that are reliably still cutting their files using the older die-cut process (which results in a superior cut quality) - Glardon Vallorbe being seemingly the lone survivor carrying that torch. They’re pricey, but my guess is that companies of this standard are not long for this world. Buy once, cry once - so long as you take care of your files and only cut metals lower in hardness than the file itself (~65rh)