size: 16.2x2 cm thickness: 5mm Before applying a decorative coating, the surface of natural or extended nails should be sanded to eliminate roughness and other microdefects - the gel polish will last longer, the manicure will look perfect. The file grinder perfectly copes with this task. In salon conditions, it is advisable to use disposable abrasive files that minimize the risk of spreading infections. The hardness of abrasive stickers is selected depending on the characteristics of the treated surface. A set of interchangeable files for a straight file (grinder) EXPERT 21 100 grit is suitable for processing extended acrylic, acrylic gel or gel nails.