This Harmony 9001K, modular black push button has 2 positions, operates with spring return mechanism. It has a chromium-plated metal bezel, a round shape and 57mm mushroom head and 1 x NO + 1 x NC contacts. This 57mm mushroom shaped push button head is ideal for situations where quick actions are required for a process or machine to function correctly or where operator movements require maximum ergonomy. It is easily combined with Harmony range of contact blocks to perform a large variety of control functions. It is clearly distinguishable visually at a distance thanks to a prominent mushroom shape. It is clearly distinguishable visually at a distance thanks to a prominent mushroom shape. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66, making it ideal for operation in harsh environments. Impact and corrosion resistant metal bezel and body ensures product continues to operate even after severe accidents.