The AllPoints Foodservice Parts & Supplies 221400 Control Knob & Dial is a versatile universal dial designed for various applications. It features a medium shaft with an outer diameter of 2-1/2 inches and an inner diameter of 5/16 inches. Constructed from durable black plastic, this control knob ensures longevity and reliable performance in foodservice environments. Its sleek design allows for easy grip and precise adjustments, making it an essential component for your equipment.