The BRÜHL-UER® overlap bolt system prevents the leaves on folding or double leaf doors from being pushed through, allowing the safety distances of the risk and hazard assessment to be maintained. This system is very robust, requires little maintenance or cleaning, and has proven itself over many years in industrial environments. Combinations are possible with a wide range of safety switches - Brühl recommends safety switches from the companies Euchner or Schmersal with a non-contact operating principle as a combination.