The classic is FSB AGL®, an acronym that has been the measure of all things on doors for decades now. FSB AGL® absorbs the forces exerted when operating lever/lever sets on heavily used doors flexibly and continuously over long periods. The tensile and compressive forces arising are reliably cushioned by means of rubber and metal joints which is taken up by low-friction, maintenance-free, Teflon- coated sliding-bearing bushings. FSB AGL® sets comprise two lever-and-rose sub-units pre-assembled at the works and includes a positive mechanism with a built-in horizontal stop that prevents handles from sagging. The levers in “normal” sets are generally pushed about 2° above their ideal horizontal position by the lock spring. The FSB AGL® positive mechanism offsets this and ensures that the handle always comes to rest at right angles to the door. Which brings us to the visual value-added: beauty facilitated by the right technology.