Early on, the Kiehl family started producing hammered files of all kinds made of pure steel. A major breakthrough was then the introduction of sapphire and diamond nail files. With these, a filing layer is applied to a steel base. This type of file was much more comfortable to use and led to a strong growth of the company in the first half of the 20th century. To this day, ablative filing coatings with diamond and sapphire stones are a core area of our production. We have extensive knowledge not only of nail files but also of diamond abrasives, foot files, industrial abrasive coatings and anti-slip surfaces.