ISTOR AG, founded in 1964 in the city Frauenfeld, is the inventor and manufacturer of the Original istor SWISS KNIFE SHARPENER. Aitor knife Sharpening tools are 100% Swiss made, one of the best knife sharpener in the world and makes an excellent impression by its versatility as sharpening tools in the home, kitchen, the garden and in the workshop. It enjoys a worldwide appreciation and is a established chefs choice when it comes to knife sharpeners. If you are looking for a knife sharpening solution, ISTOR Sharpener must be your consideration.