The AllPoints Foodservice Parts & Supplies 221082 Control Knob & Dial features a durable black plastic construction, designed for reliable performance in foodservice equipment. With an outer diameter of 1-5/16 inches and an inner diameter of 1/4 inch, this control knob is equipped with a set screw for secure attachment. The arrow indicator allows for easy and precise adjustments, making it an essential component for efficient operation. Ideal for various applications, this control knob combines functionality with a sleek design.