This black Harmony 9001SK C-cam selector switch has 3 positions and operates with a holding mechanism. It fits into a 30mm hole. This selector switch provides a versatile interface for controlling your machines. It installs easily into a standard 30mm diameter panel cutout and is easy to connect to control circuits. It provides an effective way to set your machine to different operating modes. Thanks to its IP66 rating, it is shockproof, dustproof, waterproof and vibration resistant, making it ideal for use in harsh environments.