This Harmony 9001K product is a yellow mushroom metal pushbutton head. It operates with a spring return mechanism. This pushbutton provides an ergonomic interface for your machines. It is easily installed into standard 30mm diameter panel cut-outs. It is impact-resistant, dust-resistant, water-resistant, and vibration-resistant thanks to its IP66 rating, making it ideal for operation in harsh environments. It complies with many international standards and certifications, such as NEMA, UL 508, EN/IEC 60947-5-1, EN/IEC 60947-1, EN/IEC 60947-5-4, and CSA C22.2 No 14. A dedicated contact block needs to be purchased separately. Harmony 9001K is a range of heavy-duty chromium-plated metal pushbuttons, selector switches, pilot lights, and specialty operators.