This emergency stop / shutdown button head, is easily combined with contact blocks and installed into standard 22mm diameter cut-outs and connected with simple screw-clamp connections It is clearly distinguishable visually at a distance thanks to a clear color and a prominent 40mm mushroom shape It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66 / IP67 / IP69 / IP69K, making it ideal for operation in harsh environments It is sold by 100 units High performance International standards & certifications (Marine ABS certification, IP66, Type 1, 2, 3, 3R, 4, 4X, 12 and 13)