Front element for key switch Harmony ZB4. Dimensions (WxHxD) 29x29x72 mm, mounting diameter 22 mm, weight 0.98 kg. Mechanical life 1,000,000 cycles. Lock type special key, head shape round. With high vibration resistance and chemical resistance, ambient temperature -40 to +70 degrees C. The modular metal program with 22 mm installation dimension combines easy installation, efficiency and modern design.