The AllPoints Foodservice Parts & Supplies 221241 Control Knob & Dial is designed for precise temperature control in foodservice equipment. This thermostat knob features an outer diameter of 1-3/4 inches and an inner diameter of 1/4 inch, ensuring a secure fit. Made from durable black plastic, it includes two set screws for easy installation and stability. Ideal for replacing worn or damaged knobs, this component enhances the functionality and reliability of your appliances.