Grendel bolt. Type of lock: None. Set: No. Outdoor use: Yes. Security in the name of Burg. Customers around the world have associated the Burgwächter brand with quality products "Made in Germany" for many decades. Its roots date back to the 19th century when the company F. W. Lüling was founded in Volmarstein. It specialized in the production of padlocks, which were sold under the brand "Burg." The name referred to the landmark of the area, the Volmarstein Castle, whose ruins are still visible above the Ruhr Valley today. In 1950, the descendants of the Lüling family established the current trademark.