G-clamps are the optimum solution for connecting rectangular ventilation ducts. They are easy to work with and ensure a secure, strong connection. Two G-clamps should always be placed close to the corners. The distance between two G-clamps should not exceed 250mm along the flange. Suitable for all Gebhardt flange series and flange types. All Gebhardt G-clamps delivered with fitted screw M8 x 20mm.