Bosch was the first to bring the joint-free wiper blade Aerotwin to market. By 2004, the 10 millionth Aerotwin rolled off the production line for original equipment. More and more vehicle manufacturers are adopting Aerotwin technology. Flat and elegant, the high-tech spring rail of the Aerotwin replaces conventional joint and bracket constructions. It is precisely tailored to the curvature of the windshield of each specific vehicle. For the retrofit sets, the curvature of the spring rail has been specially calculated for the windshields of these cars. The attachment technology with the clip adapter allows the flat Aerotwin wipers to snap easily onto standard hook arms. Simply hook the wiper arm into the adapter - changing the wiper blade remains as easy as ever.