Rotary handles are mechanical devices used to control the movement of machinery or equipment. They typically consist of a circular knob that can be turned to adjust settings or positions. Commonly found in appliances, vehicles, and industrial machines, rotary handles provide a simple and intuitive way to operate various functions. These handles can be made from materials like plastic or metal and often feature markings to indicate different settings. They are designed for ease of use, allowing users to make precise adjustments with minimal effort. Rotary handles are essential components in many everyday devices, enhancing user experience and functionality.