The Sontbrug in Groningen is a double bascule bridge. Both bridge traps have a width of 12 to 7.5 meters and a length of 30 meters. Each bridge trap is driven by 2 cylinders with a diameter of 480 mm and with a stroke of more than 2 meters. The unit has a capacity of 350 liters per minute and a power of 90 kW.