Dr. Tretter AG is a production and trading company of diverse machine elements for the precision field, located in Switzerland. In July 2007 the company has taken over the production of Tolerance Rings from the company Dr. Erich TRETTER GmbH Germany, which has been producing this product for more than 30 years. Tretter represents the Aluminum Rail Guides from Alulineartechnik AG and the products of the well-established company TRETTER GmbH with over 45 years of experience. Furthermore, Tretter is official representative of NSK linear systems in Switzerland. NSK is a well-respected Japanese company and is recognized as one of the world’s leading producers of high-end products in the sector Rolling Bearings, Linear Systems, Automotive Components and Steering Systems.