Mechanisms of sliding window - door frames Sliding door, shutter, and shading system mechanisms Series LLK 84 Sliding door, shutter, and shading system mechanisms (wood, aluminum, iron, and shading panel) LLK84 Series (with aluminum rail)For leaf weight up to 125 kilograms.Silent operation*The Roller Set includes:2 Rollers with their flanges1 Rolling guide2 Stoppers and leaf retainers1 Stopper View