For each lift mechanism in a cabinet door system, one arm assembly is required. This set includes two arms. AVENTOS HL covers all common door widths and heights, including wide cabinets with just five different lift mechanisms and four arm assemblies. This simplifies planning and ordering. Easy to open and stops at any position. It features silent and effortless closing and stability even with wide fronts. With AVENTOS HL, the one-piece door front lifts up vertically and provides unhindered access to the interior. This lift system is the ideal solution for upper cabinets.